diff --git a/src/game/battle.cpp b/src/game/battle.cpp
index d6b2ce8..6f361c3 100644
--- a/src/game/battle.cpp
+++ b/src/game/battle.cpp
@@ -173,7 +173,8 @@ proto::SceneBattleInfo create(Player& player, const BattleRequest& request) {
     }
 
     // ---- what they are fighting ----------------------------------------------
-    if (useSrToolsBattle(config, request.allowSrToolsOverride)) {
+    bool srtools = useSrToolsBattle(config, request.allowSrToolsOverride);
+    if (srtools) {
         info.stage_id = config.stageId;
         info.rounds_limit = config.cycleCount;
         // A calyx sweep buys several runs, one fight each, so the build's waves repeat.
@@ -289,11 +290,21 @@ proto::SceneBattleInfo create(Player& player, const BattleRequest& request) {
     context.cocoonId = request.cocoonId;
     context.wave = request.wave;
     context.monsterEntityIds = request.monsterEntityIds;
+    // A srtools build fighting in the calyx's place is not a farming run.
+    context.staminaCost = srtools ? 0 : request.staminaCost;
+    context.mappingInfoId = srtools ? 0 : request.mappingInfoId;
+    context.worldLevel = request.worldLevel != 0 ? request.worldLevel : player.worldLevel();
+    context.runs = std::max(1u, request.wave);
 
     logging::debug("battle", "battle {} stage {} with {} wave(s) and {} buff(s)", info.battle_id,
                    info.stage_id, info.monster_wave_list.size(), info.buff_list.size());
     return info;
 }
 
+bool srToolsTakesOver(const Player& player, const BattleRequest& request) {
+    Roster roster = player.roster();
+    return useSrToolsBattle(roster.data().battle, request.allowSrToolsOverride);
+}
+
 }  // namespace battle
 }  // namespace game
diff --git a/src/game/battle.h b/src/game/battle.h
index 8413f40..88e8629 100644
--- a/src/game/battle.h
+++ b/src/game/battle.h
@@ -20,6 +20,10 @@ struct BattleRequest {
     std::vector<uint32_t> stageIds;
     uint32_t cocoonId = 0;
     uint32_t wave = 0;
+    // A calyx or shadow run: what a win costs, and which drop table pays out.
+    uint32_t staminaCost = 0;
+    uint32_t mappingInfoId = 0;
+    uint32_t worldLevel = 0;
     // Only a calyx hands its fight over to a srtools build; everything else keeps the
     // stage it named. See gameplay.battle_source.
     bool allowSrToolsOverride = false;
@@ -49,5 +53,8 @@ namespace battle {
 // player so PVEBattleResult can be answered.
 proto::SceneBattleInfo create(Player& player, const BattleRequest& request);
 
+// Whether a srtools build takes this fight over, which makes it cost and pay nothing.
+bool srToolsTakesOver(const Player& player, const BattleRequest& request);
+
 }  // namespace battle
 }  // namespace game
diff --git a/src/game/battle_handlers.cpp b/src/game/battle_handlers.cpp
index f326058..5fddc63 100644
--- a/src/game/battle_handlers.cpp
+++ b/src/game/battle_handlers.cpp
@@ -6,6 +6,7 @@
 #include "game/battle.h"
 #include "game/challenge.h"
 #include "game/handlers.h"
+#include "game/inventory.h"
 #include "game/notify.h"
 #include "game/peak.h"
 #include "game/player.h"
@@ -181,26 +182,57 @@ void onSceneCastSkillCostMp(net::Session& session, const proto::SceneCastSkillCo
     session.send(cmd::SceneCastSkillCostMpScRsp, rsp);
 }
 
+int64_t now() { return static_cast<int64_t>(util::nowSec()); }
+
 // Calyx: the one fight a srtools build is allowed to take over, monsters, blessings and
 // all. `wave` is how many runs were bought, one stage each.
-proto::SceneBattleInfo cocoonBattle(Player& player, uint32_t cocoonId, uint32_t wave,
-                                    uint32_t worldLevel) {
+BattleRequest cocoonRequest(uint32_t cocoonId, uint32_t wave, uint32_t worldLevel) {
     BattleRequest request;
     request.cocoonId = cocoonId;
     request.wave = std::max(1u, wave);
     request.allowSrToolsOverride = true;
+    request.worldLevel = worldLevel;
 
     const data::CocoonInfo* cocoon = data::Tables::get().cocoon(cocoonId, worldLevel);
     if (cocoon == nullptr || cocoon->stageIds.empty()) {
         logging::warn("battle", "cocoon {} has no stage at world level {}", cocoonId, worldLevel);
-        return battle::create(player, request);
+        return request;
     }
+    request.staminaCost = cocoon->staminaCost * request.wave;
+    request.mappingInfoId = cocoon->mappingInfoId;
     // Each run draws one of the calyx's stage variants, as the real server does.
     for (uint32_t run = 0; run < request.wave; ++run) {
         uint32_t pick = util::randomRange(0, static_cast<uint32_t>(cocoon->stageIds.size()) - 1);
         request.stageIds.push_back(cocoon->stageIds[pick]);
     }
-    return battle::create(player, request);
+    return request;
+}
+
+// A run the stamina does not cover is refused before it starts. A srtools build fighting
+// in its place costs nothing.
+bool affordable(Player& player, const BattleRequest& request) {
+    if (request.staminaCost == 0 || battle::srToolsTakesOver(player, request)) return true;
+    inventory::refreshStamina(player, now());
+    return player.stamina() >= request.staminaCost;
+}
+
+// Charges `cost`, rolls `runs` runs of the drop table into the bag and tells the client.
+std::vector<data::ItemStack> payOut(net::Session& session, Player& player, uint32_t mappingInfoId,
+                                    uint32_t worldLevel, uint32_t runs, uint32_t cost) {
+    std::vector<data::ItemStack> drops;
+    if (const data::MappingInfo* table = inventory::dropTable(mappingInfoId, worldLevel)) {
+        for (uint32_t run = 0; run < runs; ++run) {
+            std::vector<data::ItemStack> rolled = inventory::rollDrops(*table, gachaRoll);
+            drops.insert(drops.end(), rolled.begin(), rolled.end());
+        }
+    }
+    drops = inventory::merged(drops);
+    inventory::chargeStamina(player, cost, now());
+    inventory::grant(player, drops);
+    session.send(cmd::PlayerSyncScNotify, inventory::sync(player, drops));
+    session.send(cmd::StaminaInfoScNotify, inventory::staminaInfo(player));
+    player.saveNow();
+    return drops;
 }
 
 void onStartCocoonStage(net::Session& session, const proto::StartCocoonStageCsReq& req) {
@@ -208,11 +240,16 @@ void onStartCocoonStage(net::Session& session, const proto::StartCocoonStageCsRe
     if (player == nullptr) return;
 
     proto::StartCocoonStageScRsp rsp;
-    rsp.retcode = 0;
     rsp.cocoon_id = req.cocoon_id;
     rsp.prop_entity_id = req.prop_entity_id;
     rsp.wave = req.wave;
-    rsp.battle_info = cocoonBattle(*player, req.cocoon_id, req.wave, player->worldLevel());
+    BattleRequest request = cocoonRequest(req.cocoon_id, req.wave, player->worldLevel());
+    if (!affordable(*player, request)) {
+        rsp.retcode = fail(proto::Retcode::RET_LACK_STAMINA);
+    } else {
+        rsp.retcode = 0;
+        rsp.battle_info = battle::create(*player, request);
+    }
     session.send(cmd::StartCocoonStageScRsp, rsp);
 }
 
@@ -223,12 +260,17 @@ void onQuickStartCocoonStage(net::Session& session,
 
     uint32_t worldLevel = req.world_level != 0 ? req.world_level : player->worldLevel();
     proto::QuickStartCocoonStageScRsp rsp;
-    rsp.retcode = 0;
     rsp.cocoon_id = req.cocoon_id;
     rsp.wave = req.wave;
-    auto& info = rsp.battle_info.emplace();
-    info = cocoonBattle(*player, req.cocoon_id, req.wave, worldLevel);
-    info.world_level = worldLevel;
+    BattleRequest request = cocoonRequest(req.cocoon_id, req.wave, worldLevel);
+    if (!affordable(*player, request)) {
+        rsp.retcode = fail(proto::Retcode::RET_LACK_STAMINA);
+    } else {
+        rsp.retcode = 0;
+        auto& info = rsp.battle_info.emplace();
+        info = battle::create(*player, request);
+        info.world_level = worldLevel;
+    }
     session.send(cmd::QuickStartCocoonStageScRsp, rsp);
 }
 
@@ -239,10 +281,16 @@ void onQuickStartFarmElement(net::Session& session,
     Player* player = playerOf(session, "QuickStartFarmElement");
     if (player == nullptr) return;
 
+    const data::Tables& tables = data::Tables::get();
     uint32_t worldLevel = req.world_level != 0 ? req.world_level : player->worldLevel();
     BattleRequest request;
-    uint32_t stageId = data::Tables::get().farmElementStage(req.PAOFHFLFFHD, worldLevel);
+    request.worldLevel = worldLevel;
+    uint32_t stageId = tables.farmElementStage(req.PAOFHFLFFHD, worldLevel);
     if (stageId != 0) request.stageIds.push_back(stageId);
+    if (const data::FarmElementInfo* element = tables.farmElement(stageId)) {
+        request.staminaCost = element->staminaCost;
+        request.mappingInfoId = element->mappingInfoId;
+    }
 
     proto::QuickStartFarmElementScRsp rsp;
     rsp.PAOFHFLFFHD = req.PAOFHFLFFHD;
@@ -250,6 +298,8 @@ void onQuickStartFarmElement(net::Session& session,
     if (request.stageIds.empty()) {
         logging::warn("battle", "farm element {} has no stage", req.PAOFHFLFFHD);
         rsp.retcode = fail(proto::Retcode::RET_STAGE_NOT_FOUND);
+    } else if (!affordable(*player, request)) {
+        rsp.retcode = fail(proto::Retcode::RET_LACK_STAMINA);
     } else {
         rsp.retcode = 0;
         auto& info = rsp.battle_info.emplace();
@@ -323,11 +373,18 @@ void onReEnterLastElementStage(net::Session& session,
     // The retry button names the stage it wants replayed.
     BattleRequest request;
     if (req.stage_id != 0) request.stageIds.push_back(req.stage_id);
+    if (const data::FarmElementInfo* element = data::Tables::get().farmElement(req.stage_id)) {
+        request.staminaCost = element->staminaCost;
+        request.mappingInfoId = element->mappingInfoId;
+        request.worldLevel = element->worldLevel;
+    }
 
     proto::ReEnterLastElementStageScRsp rsp;
     rsp.stage_id = req.stage_id;
     if (request.stageIds.empty()) {
         rsp.retcode = fail(proto::Retcode::RET_STAGE_NOT_FOUND);
+    } else if (!affordable(*player, request)) {
+        rsp.retcode = fail(proto::Retcode::RET_LACK_STAMINA);
     } else {
         rsp.retcode = 0;
         rsp.battle_info = battle::create(*player, request);
@@ -335,14 +392,73 @@ void onReEnterLastElementStage(net::Session& session,
     session.send(cmd::ReEnterLastElementStageScRsp, rsp);
 }
 
+// Clears the calyx as many times as the stamina covers, in one go.
+void onCocoonSweep(net::Session& session, const proto::CocoonSweepCsReq& req) {
+    Player* player = playerOf(session, "CocoonSweep");
+    if (player == nullptr) return;
+
+    uint32_t worldLevel = req.world_level != 0 ? req.world_level : player->worldLevel();
+    const data::CocoonInfo* cocoon = data::Tables::get().cocoon(req.cocoon_id, worldLevel);
+    inventory::refreshStamina(*player, now());
+
+    proto::CocoonSweepScRsp rsp;
+    rsp.cocoon_id = req.cocoon_id;
+    if (cocoon == nullptr || cocoon->staminaCost == 0) {
+        rsp.retcode = fail(proto::Retcode::RET_STAGE_NOT_FOUND);
+    } else if (player->stamina() < cocoon->staminaCost) {
+        rsp.retcode = fail(proto::Retcode::RET_LACK_STAMINA);
+    } else {
+        uint32_t runs = player->stamina() / cocoon->staminaCost;
+        std::vector<data::ItemStack> drops = payOut(session, *player, cocoon->mappingInfoId, worldLevel,
+                                                    runs, runs * cocoon->staminaCost);
+        rsp.retcode = 0;
+        rsp.NCEFJFOHGBI = runs;
+        rsp.multiple_drop_data = inventory::itemList(drops);
+    }
+    session.send(cmd::CocoonSweepScRsp, rsp);
+}
+
+// The same for a Stagnant Shadow, named the way QuickStartFarmElement names it.
+void onFarmElementSweep(net::Session& session, const proto::FarmElementSweepCsReq& req) {
+    Player* player = playerOf(session, "FarmElementSweep");
+    if (player == nullptr) return;
+
+    const data::Tables& tables = data::Tables::get();
+    uint32_t worldLevel = req.world_level != 0 ? req.world_level : player->worldLevel();
+    const data::FarmElementInfo* element =
+        tables.farmElement(tables.farmElementStage(req.PAOFHFLFFHD, worldLevel));
+    inventory::refreshStamina(*player, now());
+
+    proto::FarmElementSweepScRsp rsp;
+    rsp.PAOFHFLFFHD = req.PAOFHFLFFHD;
+    if (element == nullptr || element->staminaCost == 0) {
+        rsp.retcode = fail(proto::Retcode::RET_STAGE_NOT_FOUND);
+    } else if (player->stamina() < element->staminaCost) {
+        rsp.retcode = fail(proto::Retcode::RET_LACK_STAMINA);
+    } else {
+        uint32_t runs = player->stamina() / element->staminaCost;
+        uint32_t level = element->worldLevel != 0 ? element->worldLevel : worldLevel;
+        std::vector<data::ItemStack> drops = payOut(session, *player, element->mappingInfoId, level,
+                                                    runs, runs * element->staminaCost);
+        rsp.retcode = 0;
+        rsp.multiple_drop_data = inventory::itemList(drops);
+    }
+    session.send(cmd::FarmElementSweepScRsp, rsp);
+}
+
 void onPveBattleResult(net::Session& session, const proto::PVEBattleResultCsReq& req) {
     Player* player = playerOf(session, "PVEBattleResult");
     if (player == nullptr) return;
 
     BattleContext& context = player->battle();
-    if (req.end_status == proto::BattleEndStatus::BATTLE_END_WIN && context.active &&
-        context.battleId == req.battle_id) {
-        notify::monstersRemoved(session, *player, context.monsterEntityIds);
+    bool won = req.end_status == proto::BattleEndStatus::BATTLE_END_WIN && context.active &&
+               context.battleId == req.battle_id;
+    if (won) notify::monstersRemoved(session, *player, context.monsterEntityIds);
+    // A farming run costs and pays only when it is won; losing or fleeing is free.
+    std::vector<data::ItemStack> drops;
+    if (won && (context.staminaCost != 0 || context.mappingInfoId != 0)) {
+        drops = payOut(session, *player, context.mappingInfoId, context.worldLevel, context.runs,
+                       context.staminaCost);
     }
     context.active = false;
     context.monsterEntityIds.clear();
@@ -360,6 +476,7 @@ void onPveBattleResult(net::Session& session, const proto::PVEBattleResultCsReq&
     rsp.stage_id = req.stage_id;
     rsp.end_status = req.end_status;
     rsp.check_identical = true;
+    if (!drops.empty()) rsp.drop_data = inventory::itemList(drops);
     session.send(cmd::PVEBattleResultScRsp, rsp);
 }
 
@@ -382,6 +499,8 @@ void registerBattleHandlers() {
                                                   onSceneReviveAfterRebattle);
     net::on<proto::ReEnterLastElementStageCsReq>(cmd::ReEnterLastElementStageCsReq,
                                                  onReEnterLastElementStage);
+    net::on<proto::CocoonSweepCsReq>(cmd::CocoonSweepCsReq, onCocoonSweep);
+    net::on<proto::FarmElementSweepCsReq>(cmd::FarmElementSweepCsReq, onFarmElementSweep);
 }
 
 }  // namespace game
diff --git a/src/game/inventory.cpp b/src/game/inventory.cpp
new file mode 100644
index 0000000..7ca47c5
--- /dev/null
+++ b/src/game/inventory.cpp
@@ -0,0 +1,228 @@
+#include "game/inventory.h"
+
+#include <algorithm>
+#include <limits>
+#include <map>
+#include <set>
+
+#include "game/player.h"
+
+namespace game::inventory {
+namespace {
+
+constexpr uint32_t kNoLimit = std::numeric_limits<uint32_t>::max();
+constexpr uint32_t kMaxWorldLevel = 6;
+
+bool inWallet(uint32_t id) {
+    return id == kStellarJade || id == kCredit || id == kOneiricShard || id == kStamina ||
+           id == kReserveStamina || id == kTrailblazeExp;
+}
+
+void add(uint32_t& field, uint32_t amount, uint32_t limit) {
+    field = static_cast<uint32_t>(std::min<uint64_t>(uint64_t{field} + amount, limit));
+}
+
+uint32_t randomBetween(uint32_t low, uint32_t high, const std::function<double()>& roll) {
+    if (high <= low) return low;
+    auto offset = static_cast<uint32_t>(roll() * static_cast<double>(high - low + 1));
+    return low + std::min(offset, high - low);
+}
+
+// How many of a material with no listed count drop, by ItemConfig.PurposeType.
+uint32_t dropAmount(const data::ItemInfo& item, uint32_t level) {
+    switch (item.purposeType) {
+        case 1:  // character EXP
+            if (item.rarity == 2) return level < 3 ? level + 3 : 2;
+            if (item.rarity == 3) return level < 3 ? level + 3 : level * 2 - 3;
+            return 1;
+        case 2:  // Stagnant Shadow materials
+            return level;
+        case 3:  // trace materials
+            return 5;
+        case 4:  // Echo of War materials
+            return (level + 1) / 2;
+        case 5:  // light cone EXP
+            if (item.rarity == 2) return std::max<uint32_t>(level < 5 ? 5 - level : 0, 2);
+            if (item.rarity == 3) return level % 3 + 1;
+            return 1;
+        case 11:
+            return 4 + level;
+        default:
+            return 0;
+    }
+}
+
+}  // namespace
+
+void refreshStamina(Player& player, int64_t now) {
+    Inventory& bag = player.inventory();
+    const data::StaminaRules& rules = data::Tables::get().staminaRules();
+    if (bag.staminaUpdatedAt == 0 || now < bag.staminaUpdatedAt) {
+        bag.staminaUpdatedAt = now;
+        return;
+    }
+
+    if (bag.stamina < rules.max && rules.recoverSeconds != 0) {
+        int64_t gained = (now - bag.staminaUpdatedAt) / rules.recoverSeconds;
+        int64_t missing = rules.max - bag.stamina;
+        if (gained < missing) {
+            bag.stamina += static_cast<uint32_t>(gained);
+            bag.staminaUpdatedAt += gained * rules.recoverSeconds;
+            return;
+        }
+        bag.stamina = rules.max;
+        bag.staminaUpdatedAt += missing * rules.recoverSeconds;
+    }
+
+    // Full, so the time runs into reserve stamina instead.
+    if (rules.reserveRecoverSeconds == 0 || bag.reserveStamina >= rules.reserveMax) {
+        bag.staminaUpdatedAt = now;
+        return;
+    }
+    int64_t reserve = (now - bag.staminaUpdatedAt) / rules.reserveRecoverSeconds;
+    bag.reserveStamina = static_cast<uint32_t>(
+        std::min<int64_t>(rules.reserveMax, int64_t{bag.reserveStamina} + reserve));
+    bag.staminaUpdatedAt += reserve * rules.reserveRecoverSeconds;
+    if (bag.reserveStamina >= rules.reserveMax) bag.staminaUpdatedAt = now;
+}
+
+int64_t nextRecoverTime(const Player& player) {
+    const Inventory& bag = player.inventory();
+    const data::StaminaRules& rules = data::Tables::get().staminaRules();
+    return bag.stamina < rules.max ? bag.staminaUpdatedAt + rules.recoverSeconds : 0;
+}
+
+void chargeStamina(Player& player, uint32_t cost, int64_t now) {
+    refreshStamina(player, now);
+    Inventory& bag = player.inventory();
+    bool wasFull = bag.stamina >= data::Tables::get().staminaRules().max;
+    bag.stamina -= std::min(cost, bag.stamina);
+    if (wasFull && bag.stamina < data::Tables::get().staminaRules().max) bag.staminaUpdatedAt = now;
+}
+
+void grant(Player& player, const std::vector<data::ItemStack>& items) {
+    Inventory& bag = player.inventory();
+    const data::Tables& tables = data::Tables::get();
+    for (const data::ItemStack& stack : items) {
+        if (stack.num == 0) continue;
+        switch (stack.id) {
+            case kStellarJade: add(bag.hcoin, stack.num, kNoLimit); break;
+            case kCredit: add(bag.scoin, stack.num, kNoLimit); break;
+            case kOneiricShard: add(bag.mcoin, stack.num, kNoLimit); break;
+            case kStamina: add(bag.stamina, stack.num, kNoLimit); break;
+            case kReserveStamina:
+                add(bag.reserveStamina, stack.num, tables.staminaRules().reserveMax);
+                break;
+            case kTrailblazeExp: break;
+            default: {
+                const data::ItemInfo* info = tables.item(stack.id);
+                uint32_t limit = info != nullptr && info->pileLimit != 0 ? info->pileLimit : kNoLimit;
+                add(bag.items[stack.id], stack.num, limit);
+            }
+        }
+    }
+}
+
+const data::MappingInfo* dropTable(uint32_t mappingInfoId, uint32_t worldLevel) {
+    if (mappingInfoId == 0) return nullptr;
+    const data::Tables& tables = data::Tables::get();
+    int64_t wanted = std::min(worldLevel, kMaxWorldLevel);
+    // Downwards first: a lower level never pays more than the player earned.
+    for (int64_t distance = 0; distance <= kMaxWorldLevel; ++distance) {
+        for (int64_t level : {wanted - distance, wanted + distance}) {
+            if (level < 0 || level > kMaxWorldLevel || (distance == 0 && level != wanted)) continue;
+            const data::MappingInfo* table = tables.mappingInfo(mappingInfoId, static_cast<uint32_t>(level));
+            if (table != nullptr && !table->display.empty()) return table;
+        }
+    }
+    return nullptr;
+}
+
+std::vector<data::ItemStack> rollDrops(const data::MappingInfo& table,
+                                       const std::function<double()>& roll) {
+    const data::Tables& tables = data::Tables::get();
+    uint32_t level = table.worldLevel;
+    std::vector<data::ItemStack> drops;
+    for (const data::ItemStack& shown : table.display) {
+        uint32_t amount = shown.num;
+        if (amount == 0 && shown.id == kCredit) {
+            amount = randomBetween((50 + level * 10) * table.farmType,
+                                   (100 + level * 10) * table.farmType, roll);
+        } else if (amount == 0) {
+            const data::ItemInfo* item = tables.item(shown.id);
+            if (item != nullptr && item->mainType == "Material") amount = dropAmount(*item, level);
+        }
+        if (amount != 0) drops.push_back({shown.id, amount});
+    }
+    return drops;
+}
+
+std::vector<data::ItemStack> rewardItems(const data::RewardInfo& reward) {
+    std::vector<data::ItemStack> items;
+    if (reward.hcoin != 0) items.push_back({kStellarJade, reward.hcoin});
+    items.insert(items.end(), reward.items.begin(), reward.items.end());
+    return items;
+}
+
+std::vector<data::ItemStack> merged(const std::vector<data::ItemStack>& items) {
+    std::vector<data::ItemStack> out;
+    for (const data::ItemStack& stack : items) {
+        auto it = std::find_if(out.begin(), out.end(),
+                               [&](const data::ItemStack& s) { return s.id == stack.id; });
+        if (it == out.end()) {
+            out.push_back(stack);
+        } else {
+            add(it->num, stack.num, kNoLimit);
+        }
+    }
+    return out;
+}
+
+proto::ItemList itemList(const std::vector<data::ItemStack>& items) {
+    proto::ItemList list;
+    for (const data::ItemStack& stack : items) {
+        proto::Item item;
+        item.item_id = stack.id;
+        item.num = stack.num;
+        list.item_list.push_back(item);
+    }
+    return list;
+}
+
+proto::PlayerBasicInfo basicInfo(const Player& player) {
+    proto::PlayerBasicInfo info;
+    info.nickname = player.name();
+    info.level = player.level();
+    info.world_level = player.worldLevel();
+    info.stamina = player.stamina();
+    info.hcoin = player.hcoin();
+    info.scoin = player.scoin();
+    info.mcoin = player.mcoin();
+    return info;
+}
+
+proto::PlayerSyncScNotify sync(const Player& player, const std::vector<data::ItemStack>& changed) {
+    proto::PlayerSyncScNotify notify;
+    notify.basic_info.emplace() = basicInfo(player);
+    const Inventory& bag = player.inventory();
+    std::set<uint32_t> seen;
+    for (const data::ItemStack& stack : changed) {
+        if (inWallet(stack.id) || !seen.insert(stack.id).second) continue;
+        auto it = bag.items.find(stack.id);
+        proto::Material material;
+        material.tid = stack.id;
+        material.num = it == bag.items.end() ? 0 : it->second;
+        notify.material_list.push_back(material);
+    }
+    return notify;
+}
+
+proto::StaminaInfoScNotify staminaInfo(const Player& player) {
+    proto::StaminaInfoScNotify notify;
+    notify.stamina = player.stamina();
+    notify.next_recover_time = nextRecoverTime(player);
+    notify.reserve_stamina = player.inventory().reserveStamina;
+    return notify;
+}
+
+}  // namespace game::inventory
diff --git a/src/game/inventory.h b/src/game/inventory.h
new file mode 100644
index 0000000..915d0fd
--- /dev/null
+++ b/src/game/inventory.h
@@ -0,0 +1,54 @@
+#pragma once
+
+#include <cstdint>
+#include <functional>
+#include <vector>
+
+#include "data/excel.h"
+#include "proto/gen/protos.h"
+
+namespace game {
+
+class Player;
+
+namespace inventory {
+
+// Ids the wallet and stamina use instead of the bag.
+constexpr uint32_t kStellarJade = 1;
+constexpr uint32_t kCredit = 2;
+constexpr uint32_t kOneiricShard = 3;
+constexpr uint32_t kStamina = 11;
+constexpr uint32_t kReserveStamina = 12;
+constexpr uint32_t kTrailblazeExp = 22;
+
+// Stamina and reserve stamina brought up to `now` (unix seconds) at the table's rates.
+void refreshStamina(Player& player, int64_t now);
+// When the next point comes in; 0 while stamina is full.
+int64_t nextRecoverTime(const Player& player);
+// Takes up to `cost`. Dropping below full starts the recovery clock.
+void chargeStamina(Player& player, uint32_t cost, int64_t now);
+
+// Puts items where they go: the wallet, stamina, or the bag up to each item's pile limit.
+// Trailblaze EXP has nowhere to go while the level is fixed.
+void grant(Player& player, const std::vector<data::ItemStack>& items);
+
+// A farming spot's drop table at `worldLevel`, or at the nearest world level that lists
+// any drops: the tables leave some levels empty.
+const data::MappingInfo* dropTable(uint32_t mappingInfoId, uint32_t worldLevel);
+// One run's drops. A listed count drops as is; the rest are sized by the item's kind and
+// the table's world level.
+std::vector<data::ItemStack> rollDrops(const data::MappingInfo& table,
+                                       const std::function<double()>& roll);
+// RewardData as items, its Stellar Jade included.
+std::vector<data::ItemStack> rewardItems(const data::RewardInfo& reward);
+// Repeats of one item summed, in first-seen order.
+std::vector<data::ItemStack> merged(const std::vector<data::ItemStack>& items);
+
+proto::ItemList itemList(const std::vector<data::ItemStack>& items);
+proto::PlayerBasicInfo basicInfo(const Player& player);
+// The bag entries for `changed`, with the wallet and stamina alongside.
+proto::PlayerSyncScNotify sync(const Player& player, const std::vector<data::ItemStack>& changed);
+proto::StaminaInfoScNotify staminaInfo(const Player& player);
+
+}  // namespace inventory
+}  // namespace game
diff --git a/src/game/inventory_handlers.cpp b/src/game/inventory_handlers.cpp
index c446386..354ee15 100644
--- a/src/game/inventory_handlers.cpp
+++ b/src/game/inventory_handlers.cpp
@@ -1,5 +1,11 @@
+#include <ctime>
+#include <vector>
+
 #include "core/logger.h"
+#include "core/util.h"
+#include "data/excel.h"
 #include "game/handlers.h"
+#include "game/inventory.h"
 #include "game/player.h"
 #include "net/cmd_ids.h"
 #include "net/handler.h"
@@ -9,16 +15,40 @@
 namespace game {
 namespace {
 
-// Warp currency, so the banner screens are usable without a real inventory.
+// Warp currency, kept topped up: pulls only show results and never spend it.
 constexpr uint32_t kStockedMaterials[] = {101, 102};
 constexpr uint32_t kStockedAmount = 999999;
 
-void onGetBag(net::Session& session, const proto::GetBagCsReq&) {
+Player* playerOf(net::Session& session, const char* what) {
     Player* player = session.player();
-    if (player == nullptr) {
-        logging::warn("game", "GetBag before login");
-        return;
+    if (player == nullptr) logging::warn("game", "{} before login", what);
+    return player;
+}
+
+bool stocked(uint32_t tid) {
+    for (uint32_t id : kStockedMaterials) {
+        if (id == tid) return true;
     }
+    return false;
+}
+
+int64_t now() { return static_cast<int64_t>(util::nowSec()); }
+
+// The local date as yyyymmdd, which the daily stamina purchases count against.
+int64_t localDate(int64_t seconds) {
+    std::time_t t = static_cast<std::time_t>(seconds);
+    std::tm tm{};
+#ifdef _WIN32
+    localtime_s(&tm, &t);
+#else
+    localtime_r(&t, &tm);
+#endif
+    return int64_t{tm.tm_year + 1900} * 10000 + (tm.tm_mon + 1) * 100 + tm.tm_mday;
+}
+
+void onGetBag(net::Session& session, const proto::GetBagCsReq&) {
+    Player* player = playerOf(session, "GetBag");
+    if (player == nullptr) return;
     Roster roster = player->roster();
 
     proto::GetBagScRsp rsp;
@@ -29,6 +59,13 @@ void onGetBag(net::Session& session, const proto::GetBagCsReq&) {
     for (const Relic& relic : roster.data().relics) {
         rsp.relic_list.push_back(roster.toRelic(relic));
     }
+    for (const auto& [tid, count] : player->inventory().items) {
+        if (count == 0 || stocked(tid)) continue;
+        proto::Material material;
+        material.tid = tid;
+        material.num = count;
+        rsp.material_list.push_back(material);
+    }
     for (uint32_t tid : kStockedMaterials) {
         proto::Material material;
         material.tid = tid;
@@ -38,10 +75,78 @@ void onGetBag(net::Session& session, const proto::GetBagCsReq&) {
     session.send(cmd::GetBagScRsp, rsp);
 }
 
+// Stellar Jade for stamina, at StaminaSaleConfig's price for today's purchase number.
+void onExchangeStamina(net::Session& session, const proto::ExchangeStaminaCsReq&) {
+    Player* player = playerOf(session, "ExchangeStamina");
+    if (player == nullptr) return;
+
+    const data::Tables& tables = data::Tables::get();
+    inventory::refreshStamina(*player, now());
+    Inventory& bag = player->inventory();
+    if (int64_t today = localDate(now()); bag.purchaseDay != today) {
+        bag.purchaseDay = today;
+        bag.purchasesToday = 0;
+    }
+
+    const std::vector<uint32_t>& prices = tables.staminaPrices();
+    proto::ExchangeStaminaScRsp rsp;
+    if (bag.purchasesToday >= prices.size()) {
+        rsp.retcode = fail(proto::Retcode::RET_LACK_EXCHANGE_STAMINA_TIMES);
+    } else if (bag.hcoin < prices[bag.purchasesToday]) {
+        rsp.retcode = fail(proto::Retcode::RET_ITEM_NOT_ENOUGH);
+    } else {
+        uint32_t price = prices[bag.purchasesToday];
+        bag.hcoin -= price;
+        ++bag.purchasesToday;
+        inventory::grant(*player, {{inventory::kStamina, tables.staminaPerPurchase()}});
+
+        rsp.retcode = 0;
+        rsp.stamina_add = tables.staminaPerPurchase();
+        rsp.exchange_times = bag.purchasesToday;
+        rsp.last_recover_time = inventory::nextRecoverTime(*player);
+        proto::ItemCost cost;
+        auto& jade = cost.pile_item.emplace();
+        jade.item_id = inventory::kStellarJade;
+        jade.item_num = price;
+        cost.item_case = proto::ItemCost::k_pile_item;
+        rsp.item_cost_list.push_back(cost);
+
+        session.send(cmd::PlayerSyncScNotify, inventory::sync(*player, {}));
+        session.send(cmd::StaminaInfoScNotify, inventory::staminaInfo(*player));
+        player->saveNow();
+    }
+    session.send(cmd::ExchangeStaminaScRsp, rsp);
+}
+
+// Moves banked reserve stamina into stamina.
+void onReserveStaminaExchange(net::Session& session, const proto::ReserveStaminaExchangeCsReq& req) {
+    Player* player = playerOf(session, "ReserveStaminaExchange");
+    if (player == nullptr) return;
+
+    inventory::refreshStamina(*player, now());
+    Inventory& bag = player->inventory();
+    proto::ReserveStaminaExchangeScRsp rsp;
+    if (req.num == 0 || req.num > bag.reserveStamina) {
+        rsp.retcode = fail(proto::Retcode::RET_ITEM_NOT_ENOUGH);
+    } else {
+        bag.reserveStamina -= req.num;
+        inventory::grant(*player, {{inventory::kStamina, req.num}});
+        rsp.retcode = 0;
+        rsp.num = req.num;
+        session.send(cmd::PlayerSyncScNotify, inventory::sync(*player, {}));
+        session.send(cmd::StaminaInfoScNotify, inventory::staminaInfo(*player));
+        player->saveNow();
+    }
+    session.send(cmd::ReserveStaminaExchangeScRsp, rsp);
+}
+
 }  // namespace
 
 void registerInventoryHandlers() {
     net::on<proto::GetBagCsReq>(cmd::GetBagCsReq, onGetBag);
+    net::on<proto::ExchangeStaminaCsReq>(cmd::ExchangeStaminaCsReq, onExchangeStamina);
+    net::on<proto::ReserveStaminaExchangeCsReq>(cmd::ReserveStaminaExchangeCsReq,
+                                                onReserveStaminaExchange);
 }
 
 }  // namespace game
diff --git a/src/game/login_handlers.cpp b/src/game/login_handlers.cpp
index 455839a..4386a02 100644
--- a/src/game/login_handlers.cpp
+++ b/src/game/login_handlers.cpp
@@ -2,6 +2,7 @@
 #include "core/logger.h"
 #include "core/util.h"
 #include "game/handlers.h"
+#include "game/inventory.h"
 #include "game/player.h"
 #include "net/cmd_ids.h"
 #include "net/handler.h"
@@ -21,13 +22,7 @@ constexpr uint32_t kUnlockedContentPackages[] = {
     140006, 171002};
 
 void fillBasicInfo(proto::PlayerBasicInfo& info, const Player& player) {
-    info.nickname = player.name();
-    info.level = player.level();
-    info.world_level = player.worldLevel();
-    info.stamina = player.stamina();
-    info.hcoin = player.hcoin();
-    info.scoin = player.scoin();
-    info.mcoin = player.mcoin();
+    info = inventory::basicInfo(player);
 }
 
 void onGetToken(net::Session& session, const proto::PlayerGetTokenCsReq& req) {
@@ -40,6 +35,7 @@ void onGetToken(net::Session& session, const proto::PlayerGetTokenCsReq& req) {
     player->setMarchType(core::Config::get().gameplay.marchType);
     player->setGlobalBuffs(core::Config::get().gameplay.globalBuffs);
     player->load();
+    inventory::refreshStamina(*player, static_cast<int64_t>(util::nowSec()));
     session.setPlayer(player);
     session.setState(net::SessionState::WaitingForLogin);
 
@@ -85,6 +81,7 @@ void onLoginFinish(net::Session& session, const proto::PlayerLoginFinishCsReq&)
             data.content_package_list.push_back(info);
         }
         session.send(cmd::ContentPackageSyncDataScNotify, notify);
+        session.send(cmd::StaminaInfoScNotify, inventory::staminaInfo(*player));
     }
 
     proto::PlayerLoginFinishScRsp rsp;
@@ -110,7 +107,7 @@ void onGetBasicInfo(net::Session& session, const proto::GetBasicInfoCsReq&) {
     rsp.is_gender_set = true;
     rsp.gender = player != nullptr ? player->gender() : 2;
     rsp.cur_day = 1;
-    rsp.next_recover_time = static_cast<int64_t>(util::nowSec() + 300);
+    rsp.next_recover_time = player != nullptr ? inventory::nextRecoverTime(*player) : 0;
     session.send(cmd::GetBasicInfoScRsp, rsp);
 }
 
diff --git a/src/game/player.cpp b/src/game/player.cpp
index 122e044..a3bd1cd 100644
--- a/src/game/player.cpp
+++ b/src/game/player.cpp
@@ -90,11 +90,11 @@ Player::Player(uint32_t uid) : uid_(uid) {
     signature_ = defaults.signature;
     level_ = defaults.level;
     worldLevel_ = defaults.worldLevel;
-    stamina_ = defaults.stamina;
     headIcon_ = defaults.headIcon;
-    hcoin_ = defaults.hcoin;
-    scoin_ = defaults.scoin;
-    mcoin_ = defaults.mcoin;
+    inventory_.stamina = defaults.stamina;
+    inventory_.hcoin = defaults.hcoin;
+    inventory_.scoin = defaults.scoin;
+    inventory_.mcoin = defaults.mcoin;
 }
 
 uint32_t Player::gender() const {
diff --git a/src/game/player.h b/src/game/player.h
index 1635a15..88b9e4f 100644
--- a/src/game/player.h
+++ b/src/game/player.h
@@ -23,6 +23,24 @@ struct BattleContext {
     uint32_t wave = 0;
     std::vector<uint32_t> monsterEntityIds;
     bool active = false;
+    // A calyx or shadow run: what a win costs and which drop table it pays from.
+    uint32_t staminaCost = 0;
+    uint32_t mappingInfoId = 0;
+    uint32_t worldLevel = 0;
+    uint32_t runs = 1;
+};
+
+// Stamina, the wallet and the bag. Saved.
+struct Inventory {
+    uint32_t stamina = 240;
+    uint32_t reserveStamina = 0;
+    int64_t staminaUpdatedAt = 0;  // unix seconds stamina was last brought up to date
+    uint32_t purchasesToday = 0;
+    int64_t purchaseDay = 0;  // the local date of those purchases, as yyyymmdd
+    uint32_t hcoin = 0;
+    uint32_t scoin = 0;
+    uint32_t mcoin = 0;
+    std::map<uint32_t, uint32_t> items;
 };
 
 // A challenge run in progress. Not persisted: leaving the client mid-floor drops the
@@ -137,12 +155,14 @@ public:
     void setSignature(std::string value) { signature_ = std::move(value); }
     uint32_t level() const { return level_; }
     uint32_t worldLevel() const { return worldLevel_; }
-    uint32_t stamina() const { return stamina_; }
+    uint32_t stamina() const { return inventory_.stamina; }
     uint32_t headIcon() const { return headIcon_; }
     void setHeadIcon(uint32_t value) { headIcon_ = value; }
-    uint32_t hcoin() const { return hcoin_; }
-    uint32_t scoin() const { return scoin_; }
-    uint32_t mcoin() const { return mcoin_; }
+    uint32_t hcoin() const { return inventory_.hcoin; }
+    uint32_t scoin() const { return inventory_.scoin; }
+    uint32_t mcoin() const { return inventory_.mcoin; }
+    Inventory& inventory() { return inventory_; }
+    const Inventory& inventory() const { return inventory_; }
     uint64_t loginRandom() const { return loginRandom_; }
     void setLoginRandom(uint64_t value) { loginRandom_ = value; }
 
@@ -195,12 +215,9 @@ private:
     std::string signature_;
     uint32_t level_ = 1;
     uint32_t worldLevel_ = 0;
-    uint32_t stamina_ = 240;
     uint32_t headIcon_ = 201001;
-    uint32_t hcoin_ = 0;
-    uint32_t scoin_ = 0;
-    uint32_t mcoin_ = 0;
     uint64_t loginRandom_ = 0;
+    Inventory inventory_;
 
     LineupBook lineups_;
     Position position_;
diff --git a/src/game/player_store.cpp b/src/game/player_store.cpp
index 390f1b7..0576196 100644
--- a/src/game/player_store.cpp
+++ b/src/game/player_store.cpp
@@ -1,5 +1,6 @@
 #include "game/player_store.h"
 
+#include <cstdlib>
 #include <nlohmann/json.hpp>
 
 #include "core/config.h"
@@ -23,6 +24,11 @@ int32_t i32(const json& j, const char* key, int32_t fallback) {
     return (it != j.end() && it->is_number()) ? it->get<int32_t>() : fallback;
 }
 
+int64_t i64(const json& j, const char* key, int64_t fallback) {
+    auto it = j.find(key);
+    return (it != j.end() && it->is_number()) ? it->get<int64_t>() : fallback;
+}
+
 bool boolOr(const json& j, const char* key, bool fallback) {
     auto it = j.find(key);
     return (it != j.end() && it->is_boolean()) ? it->get<bool>() : fallback;
@@ -188,6 +194,26 @@ bool loadPlayerState(Player& player) {
         readPity("character", player.gacha().character);
         readPity("lightcone", player.gacha().lightcone);
     }
+
+    if (auto saved = j.find("inventory"); saved != j.end() && saved->is_object()) {
+        Inventory& bag = player.inventory();
+        bag.stamina = u32(*saved, "stamina", bag.stamina);
+        bag.reserveStamina = u32(*saved, "reserve_stamina", 0);
+        bag.staminaUpdatedAt = i64(*saved, "stamina_updated_at", 0);
+        bag.purchasesToday = u32(*saved, "stamina_purchases", 0);
+        bag.purchaseDay = i64(*saved, "stamina_purchase_day", 0);
+        bag.hcoin = u32(*saved, "hcoin", bag.hcoin);
+        bag.scoin = u32(*saved, "scoin", bag.scoin);
+        bag.mcoin = u32(*saved, "mcoin", bag.mcoin);
+        if (auto items = saved->find("items"); items != saved->end() && items->is_object()) {
+            for (const auto& entry : items->items()) {
+                auto id = static_cast<uint32_t>(std::strtoul(entry.key().c_str(), nullptr, 10));
+                if (id != 0 && entry.value().is_number_unsigned()) {
+                    bag.items[id] = entry.value().get<uint32_t>();
+                }
+            }
+        }
+    }
     return true;
 }
 
@@ -272,6 +298,21 @@ std::string playerStateJson(const Player& player) {
                   {"character", pity(gacha.character)},
                   {"lightcone", pity(gacha.lightcone)}};
 
+    const Inventory& bag = player.inventory();
+    json items = json::object();
+    for (const auto& [id, count] : bag.items) {
+        if (count != 0) items[std::to_string(id)] = count;
+    }
+    j["inventory"] = {{"stamina", bag.stamina},
+                      {"reserve_stamina", bag.reserveStamina},
+                      {"stamina_updated_at", bag.staminaUpdatedAt},
+                      {"stamina_purchases", bag.purchasesToday},
+                      {"stamina_purchase_day", bag.purchaseDay},
+                      {"hcoin", bag.hcoin},
+                      {"scoin", bag.scoin},
+                      {"mcoin", bag.mcoin},
+                      {"items", items}};
+
     return j.dump(2);
 }
 
diff --git a/tests/test_flow.cpp b/tests/test_flow.cpp
index ae34401..80e79c0 100644
--- a/tests/test_flow.cpp
+++ b/tests/test_flow.cpp
@@ -3,6 +3,7 @@
 #include <chrono>
 #include <cstdio>
 #include <cstring>
+#include <filesystem>
 #include <string>
 #include <thread>
 #include <vector>
@@ -211,8 +212,11 @@ bool parseBody(const net::Packet& packet, T& out) {
 }  // namespace
 
 void runFlowTests() {
-    // Keep the test off the real save file.
+    // Keep the test off the real save file, and start it fresh: stamina and claimed
+    // rewards carry over between runs otherwise.
     core::Config::get().paths.playerFile = "build/test-player.json";
+    std::error_code ec;
+    std::filesystem::remove(core::Config::get().paths.playerFile, ec);
     game::registerAllHandlers();
 
     net::Gateway gateway;
@@ -1061,6 +1065,37 @@ void runFlowTests() {
           "a custom 50/50 pool is refused with a body");
     core::Config::get().gameplay.limitedWarpPools = configuredPools;
 
+    // Stamina, farming and the bag.
+    client.sendEmpty(cmd::ExchangeStaminaCsReq);
+    proto::ExchangeStaminaScRsp exchange;
+    check(client.await(cmd::ExchangeStaminaScRsp, packet) && parseBody(packet, exchange) &&
+              exchange.retcode == 0 && exchange.stamina_add == 60 && exchange.item_cost_list.size() == 1,
+          "stamina can be bought with jade");
+
+    proto::CocoonSweepCsReq sweep;
+    sweep.cocoon_id = 1001;
+    sweep.world_level = 6;
+    client.send(cmd::CocoonSweepCsReq, sweep);
+    proto::CocoonSweepScRsp swept;
+    check(client.await(cmd::CocoonSweepScRsp, packet) && parseBody(packet, swept) && swept.retcode == 0 &&
+              swept.NCEFJFOHGBI > 0 && swept.multiple_drop_data.has() &&
+              !swept.multiple_drop_data->item_list.empty(),
+          "a calyx sweep spends the stamina and drops items");
+    check(client.sawNotify(cmd::StaminaInfoScNotify) && client.sawNotify(cmd::PlayerSyncScNotify),
+          "and tells the client about both");
+
+    client.send(cmd::CocoonSweepCsReq, sweep);
+    proto::CocoonSweepScRsp dry;
+    check(client.await(cmd::CocoonSweepScRsp, packet) && parseBody(packet, dry) &&
+              dry.retcode == static_cast<uint32_t>(proto::Retcode::RET_LACK_STAMINA),
+          "with no stamina left the next sweep is refused");
+
+    client.sendEmpty(cmd::GetBagCsReq);
+    proto::GetBagScRsp bagAfter;
+    check(client.await(cmd::GetBagScRsp, packet) && parseBody(packet, bagAfter) &&
+              bagAfter.material_list.size() > 2,
+          "the drops are in the bag");
+
     // An unimplemented request still has to complete, or the client hangs on it. This
     // one has no handler at all, so it exercises the name-derived fallback.
     client.sendEmpty(cmd::GetStarFightDataCsReq);
diff --git a/tests/test_game.cpp b/tests/test_game.cpp
index a7aa7ae..60d5f88 100644
--- a/tests/test_game.cpp
+++ b/tests/test_game.cpp
@@ -17,6 +17,7 @@
 #include "game/battle.h"
 #include "game/challenge.h"
 #include "game/gacha.h"
+#include "game/inventory.h"
 #include "game/lineup.h"
 #include "game/player.h"
 #include "game/player_store.h"
@@ -413,6 +414,93 @@ void testGacha() {
     core::Config::get().paths.playerFile = realPath;
 }
 
+void testInventory() {
+    const data::Tables& tables = data::Tables::get();
+    if (!tables.loaded()) {
+        std::printf("SKIP inventory (no data source configured)\n");
+        return;
+    }
+    namespace inventory = game::inventory;
+
+    const data::StaminaRules& rules = tables.staminaRules();
+    check(rules.max == 300 && rules.recoverSeconds == 360 && rules.reserveMax == 2400 &&
+              rules.reserveRecoverSeconds == 1080,
+          "stamina rules come from the tables");
+    check(tables.staminaPrices().size() == 8 && tables.staminaPrices()[0] == 50 &&
+              tables.staminaPerPurchase() == 60,
+          "and the stamina prices");
+
+    game::Player player(1);
+    game::Inventory& bag = player.inventory();
+    bag.stamina = 100;
+    bag.staminaUpdatedAt = 1000;
+    inventory::refreshStamina(player, 1000 + 360 * 5 + 10);
+    check(bag.stamina == 105 && bag.staminaUpdatedAt == 1000 + 360 * 5,
+          "stamina recovers a point every six minutes");
+    check(inventory::nextRecoverTime(player) == 1000 + 360 * 6, "and says when the next is due");
+
+    bag.stamina = 299;
+    bag.staminaUpdatedAt = 5000;
+    bag.reserveStamina = 0;
+    inventory::refreshStamina(player, 5000 + 360 + 1080 * 2);
+    check(bag.stamina == 300 && bag.reserveStamina == 2, "once full, time runs into reserve stamina");
+    check(inventory::nextRecoverTime(player) == 0, "and nothing more is due");
+
+    inventory::chargeStamina(player, 40, 9000);
+    check(bag.stamina == 260 && bag.staminaUpdatedAt == 9000, "spending from full starts the clock");
+
+    uint32_t jade = bag.hcoin;
+    uint32_t credits = bag.scoin;
+    inventory::grant(player, {{1, 50}, {2, 1000}, {211, 3}, {22, 150}, {11, 60}});
+    check(bag.hcoin == jade + 50 && bag.scoin == credits + 1000, "jade and credits go to the wallet");
+    check(bag.items[211] == 3 && bag.stamina == 320, "materials to the bag, stamina to stamina");
+    check(bag.items.count(22) == 0, "and trailblaze exp nowhere");
+
+    const data::MappingInfo* calyx = inventory::dropTable(1001, 6);
+    check(calyx != nullptr && !calyx->display.empty(), "a calyx has a drop table at world level 6");
+    if (calyx != nullptr) {
+        bool credit = false;
+        for (const data::ItemStack& drop : inventory::rollDrops(*calyx, [] { return 0.5; })) {
+            credit |= drop.id == 2 && drop.num > 0;
+        }
+        check(credit, "and a run drops credits");
+    }
+    const data::MappingInfo* shadow = inventory::dropTable(1101, 6);
+    check(shadow != nullptr && shadow->worldLevel == 5, "a shadow's empty level falls back a level");
+    if (shadow != nullptr) {
+        bool boss = false;
+        for (const data::ItemStack& drop : inventory::rollDrops(*shadow, [] { return 0.5; })) {
+            boss |= drop.id == 110406 && drop.num == 5;
+        }
+        check(boss, "and its boss material scales with the world level");
+    }
+    check(inventory::dropTable(0, 6) == nullptr, "no table, no drops");
+
+    const data::RewardInfo* reward = tables.reward(101101);
+    check(reward != nullptr, "RewardData loads");
+    if (reward != nullptr) {
+        std::vector<data::ItemStack> items = inventory::rewardItems(*reward);
+        check(items.size() == 2 && items[0].id == 1 && items[0].num == 200 && items[1].id == 2 &&
+                  items[1].num == 20000,
+              "a reward carries its jade and items");
+    }
+    std::vector<data::ItemStack> merged = inventory::merged({{2, 10}, {211, 1}, {2, 5}});
+    check(merged.size() == 2 && merged[0].num == 15, "repeats merge");
+    proto::PlayerSyncScNotify sync = inventory::sync(player, {{211, 3}, {1, 50}});
+    check(sync.material_list.size() == 1 && sync.material_list[0].tid == 211 &&
+              sync.material_list[0].num == 3 && sync.basic_info.has(),
+          "a sync names bag totals and carries the wallet");
+
+    std::string realPath = core::Config::get().paths.playerFile;
+    core::Config::get().paths.playerFile = "build/test-inventory-player.json";
+    check(game::savePlayerState(player), "the inventory saves");
+    game::Player loaded(1);
+    check(game::loadPlayerState(loaded), "and loads");
+    check(loaded.inventory().items[211] == 3 && loaded.inventory().reserveStamina == bag.reserveStamina,
+          "the bag survives a restart");
+    core::Config::get().paths.playerFile = realPath;
+}
+
 void testChallengeHistory() {
     const data::Tables& tables = data::Tables::get();
     if (!tables.loaded()) return;
@@ -1046,6 +1134,7 @@ void runGameTests() {
     testElementBuffs();
     testTables();
     testGacha();
+    testInventory();
     testChallengeHistory();
     testSceneRes();
     testRosterProtos();