diff --git a/app/game-api/src/router/inherit/index.ts b/app/game-api/src/router/inherit/index.ts
index b67d17d8..edbc8bbc 100644
--- a/app/game-api/src/router/inherit/index.ts
+++ b/app/game-api/src/router/inherit/index.ts
@@ -13,6 +13,7 @@ import {
 } from '@sammo-ts/logic';
 import type { InheritBuffType } from '@sammo-ts/logic';
 import { simpleSerialize } from '@sammo-ts/logic/war/utils.js';
+import { resolveLegacyCompatibleUniqueConfig } from '@sammo-ts/logic/rewards/legacyUniqueItemPool.js';
 import {
     appendInheritanceLog,
     buildResetCost,
@@ -74,17 +75,17 @@ const readBuffLevel = (buff: Record<string, number>, key: InheritBuffType): numb
 };
 
 const loadAvailableUniqueItems = async (worldState: WorldStateRow) => {
-    const configuredItems = asRecord(asRecord(worldState.config).const).allItems;
+    const configConst = asRecord(asRecord(worldState.config).const);
+    const loader = new ItemLoader();
+    const { allItems } = await resolveLegacyCompatibleUniqueConfig(configConst, loader);
     const enabledKeys: Array<Parameters<ItemLoader['load']>[0]> = [];
-    for (const entries of Object.values(asRecord(configuredItems))) {
+    for (const entries of Object.values(allItems)) {
         for (const [key, amount] of Object.entries(asRecord(entries))) {
             if (asNumber(amount, 0) !== 0 && isItemKey(key)) {
                 enabledKeys.push(key);
             }
         }
     }
-
-    const loader = new ItemLoader();
     const items = await Promise.all(
         [...new Set(enabledKeys)].map(async (key) => {
             const item = await loader.load(key);
diff --git a/app/game-api/test/inheritRouter.test.ts b/app/game-api/test/inheritRouter.test.ts
index 4235177b..ae39c870 100644
--- a/app/game-api/test/inheritRouter.test.ts
+++ b/app/game-api/test/inheritRouter.test.ts
@@ -97,6 +97,7 @@ const buildContext = (options: {
     target?: GeneralRow | null;
     inheritancePoint?: number;
     inheritanceLogs?: Array<{ id: number; year: number; month: number; text: string; createdAt: Date }>;
+    configConst?: Record<string, unknown>;
 }) => {
     const auth = options.auth === undefined ? buildAuth() : options.auth;
     const general = options.general === undefined ? buildGeneral() : options.general;
@@ -113,10 +114,19 @@ const buildContext = (options: {
     const logCreate = vi.fn(async () => ({}));
     const findMany = vi.fn(async () => (target ? [{ id: target.id, name: target.name }] : []));
     const inheritanceLogFindMany = vi.fn(async () => options.inheritanceLogs ?? []);
+    const activeWorldState =
+        options.configConst === undefined
+            ? worldState
+            : {
+                  ...worldState,
+                  config: {
+                      const: options.configConst,
+                  },
+              };
     const db = {
         $queryRaw: vi.fn(async () => [{ value: options.inheritancePoint ?? 10_000 }]),
         worldState: {
-            findFirst: vi.fn(async () => worldState),
+            findFirst: vi.fn(async () => activeWorldState),
         },
         general: {
             findFirst: vi.fn(async ({ where }: { where: { userId: string } }) =>
@@ -192,6 +202,22 @@ describe('inherit router actor and permission boundaries', () => {
         });
     });
 
+    it.each([{}, { allItems: '{}' }])(
+        'restores selectable Ref default uniques for a legacy scenario config: %j',
+        async (configConst) => {
+            const fixture = buildContext({ configConst });
+            const status = await appRouter.createCaller(fixture.context).inherit.getStatus();
+
+            expect(status.availableUnique.length).toBeGreaterThan(80);
+            expect(status.availableUnique).toEqual(
+                expect.arrayContaining([
+                    expect.objectContaining({ key: 'che_무기_12_칠성검', rawName: '칠성검' }),
+                    expect.objectContaining({ key: 'che_서적_07_논어', rawName: '논어' }),
+                ])
+            );
+        }
+    );
+
     it('loads the first inheritance-log page without an out-of-range integer cursor', async () => {
         const createdAt = new Date('2026-07-26T00:00:00Z');
         const fixture = buildContext({
diff --git a/app/game-engine/src/auction/bidder.ts b/app/game-engine/src/auction/bidder.ts
index 1372c80b..4f0ac6a0 100644
--- a/app/game-engine/src/auction/bidder.ts
+++ b/app/game-engine/src/auction/bidder.ts
@@ -1,6 +1,7 @@
 import { randomUUID } from 'node:crypto';
 
 import { createGamePostgresConnector, GamePrisma, type GamePrismaClient } from '@sammo-ts/infra';
+import { isItemKey, ItemLoader } from '@sammo-ts/logic';
 
 import type { TurnDaemonCommand, TurnDaemonCommandResult } from '../lifecycle/types.js';
 import type { InMemoryTurnWorld } from '../turn/inMemoryWorld.js';
@@ -23,6 +24,7 @@ const MIN_EXTENSION_MINUTES_PER_BID = 1;
 interface AuctionRow {
     id: number;
     type: AuctionType;
+    targetCode: string | null;
     hostGeneralId: number;
     detail: unknown;
     status: AuctionStatus;
@@ -99,6 +101,7 @@ const loadAuction = async (prisma: QueryClient, auctionId: number): Promise<Auct
         GamePrisma.sql`
             SELECT id,
                 type,
+                target_code as "targetCode",
                 host_general_id as "hostGeneralId",
                 detail,
                 status,
@@ -178,6 +181,7 @@ export const createAuctionBidder = async (options: {
     await connector.connect();
     const prisma = connector.prisma;
     const world = options.world;
+    const itemLoader = new ItemLoader();
 
     return {
         bid: async (command, commandDb): Promise<TurnDaemonCommandResult> => {
@@ -290,6 +294,74 @@ export const createAuctionBidder = async (options: {
                     reason: '장수 정보를 찾을 수 없습니다.',
                 };
             }
+            if (auction.type === 'UNIQUE_ITEM') {
+                const itemKey = auction.targetCode;
+                if (!itemKey || !isItemKey(itemKey)) {
+                    return {
+                        type: 'auctionBid',
+                        ok: false,
+                        auctionId: command.auctionId,
+                        reason: '아이템이 올바르지 않습니다.',
+                    };
+                }
+                const item = await itemLoader.load(itemKey).catch(() => null);
+                if (!item || item.buyable) {
+                    return {
+                        type: 'auctionBid',
+                        ok: false,
+                        auctionId: command.auctionId,
+                        reason: item ? '구매할 수 있는 아이템입니다.' : '아이템 정보를 불러올 수 없습니다.',
+                    };
+                }
+
+                const currentSlotItem = general.role.items[item.slot];
+                if (currentSlotItem && currentSlotItem !== 'None' && isItemKey(currentSlotItem)) {
+                    const currentItem = await itemLoader.load(currentSlotItem).catch(() => null);
+                    if (currentItem && !currentItem.buyable) {
+                        return {
+                            type: 'auctionBid',
+                            ok: false,
+                            auctionId: command.auctionId,
+                            reason:
+                                currentSlotItem === itemKey
+                                    ? '이미 그 유니크를 가지고 있습니다.'
+                                    : '이미 다른 유니크를 가지고 있습니다.',
+                        };
+                    }
+                }
+
+                const otherHighestBids = await db.$queryRaw<Array<{ auctionId: number; targetCode: string | null }>>(
+                    GamePrisma.sql`
+                        SELECT candidate.id as "auctionId", candidate.target_code as "targetCode"
+                        FROM auction candidate
+                        INNER JOIN LATERAL (
+                            SELECT bid.general_id
+                            FROM auction_bid bid
+                            WHERE bid.auction_id = candidate.id
+                            ORDER BY bid.amount DESC, bid.id ASC
+                            LIMIT 1
+                        ) highest ON true
+                        WHERE candidate.type = 'UNIQUE_ITEM'
+                          AND candidate.status IN ('OPEN', 'FINALIZING')
+                          AND candidate.id <> ${auction.id}
+                          AND highest.general_id = ${command.generalId}
+                    `
+                );
+                for (const other of otherHighestBids) {
+                    if (!other.targetCode || !isItemKey(other.targetCode)) {
+                        continue;
+                    }
+                    const otherItem = await itemLoader.load(other.targetCode).catch(() => null);
+                    if (otherItem?.slot === item.slot) {
+                        return {
+                            type: 'auctionBid',
+                            ok: false,
+                            auctionId: command.auctionId,
+                            reason: '1순위 입찰자인 경매중에 같은 부위가 있습니다.',
+                        };
+                    }
+                }
+            }
             if (auction.type !== 'UNIQUE_ITEM' && auction.hostGeneralId === general.id) {
                 return {
                     type: 'auctionBid',
diff --git a/app/game-engine/src/auction/finalizer.ts b/app/game-engine/src/auction/finalizer.ts
index 04cde229..1e6d9bea 100644
--- a/app/game-engine/src/auction/finalizer.ts
+++ b/app/game-engine/src/auction/finalizer.ts
@@ -1,5 +1,6 @@
 import { createGamePostgresConnector, GamePrisma } from '@sammo-ts/infra';
-import { ActionLogger, ItemLoader, LogFormat, UserLogger, isItemKey, resolveUniqueConfig } from '@sammo-ts/logic';
+import { ActionLogger, ItemLoader, LogFormat, UserLogger, isItemKey } from '@sammo-ts/logic';
+import { resolveLegacyCompatibleUniqueConfig } from '@sammo-ts/logic/rewards/legacyUniqueItemPool.js';
 import { cloneItemInventory, ensureItemInventory, equipNewItem } from '@sammo-ts/logic/items/index.js';
 import { asRecord, JosaUtil } from '@sammo-ts/common';
 
@@ -18,6 +19,8 @@ type AuctionStatus = 'OPEN' | 'FINALIZING' | 'FINISHED' | 'CANCELED';
 const COEFF_EXTENSION_MINUTES_PER_BID = 1 / 6;
 const MIN_EXTENSION_MINUTES_PER_BID = 1;
 const MIN_EXTENSION_MINUTES_LIMIT_BY_BID = 5;
+const COEFF_EXTENSION_MINUTES_LIMIT_UNIQUE_COUNT = 24;
+const MIN_EXTENSION_MINUTES_BY_EXTENSION_QUERY = 5;
 
 interface AuctionRow {
     id: number;
@@ -363,7 +366,10 @@ export const createAuctionFinalizer = async (options: {
                 }
 
                 const state = world.getState();
-                const config = resolveUniqueConfig(asRecord(world.getScenarioConfig().const));
+                const config = await resolveLegacyCompatibleUniqueConfig(
+                    asRecord(world.getScenarioConfig().const),
+                    itemLoader
+                );
                 const scenarioMeta = asRecord(state.meta.scenarioMeta);
                 const startYear =
                     typeof scenarioMeta.startYear === 'number' && Number.isFinite(scenarioMeta.startYear)
@@ -392,7 +398,11 @@ export const createAuctionFinalizer = async (options: {
                     const turnMinutes = await resolveTurnMinutes(db);
                     const nextCloseAt = new Date(
                         auction.closeAt.getTime() +
-                            Math.max(MIN_EXTENSION_MINUTES_LIMIT_BY_BID, turnMinutes * 0.5) * 60_000
+                            Math.max(
+                                MIN_EXTENSION_MINUTES_BY_EXTENSION_QUERY,
+                                turnMinutes * COEFF_EXTENSION_MINUTES_LIMIT_UNIQUE_COUNT
+                            ) *
+                                60_000
                     );
                     const nextLatestBidCloseAt = new Date(
                         nextCloseAt.getTime() +
diff --git a/app/game-engine/src/auction/opener.ts b/app/game-engine/src/auction/opener.ts
index 7c47bfd7..e83c43f6 100644
--- a/app/game-engine/src/auction/opener.ts
+++ b/app/game-engine/src/auction/opener.ts
@@ -2,14 +2,8 @@ import { randomUUID } from 'node:crypto';
 
 import { asRecord, JosaUtil } from '@sammo-ts/common';
 import { acquireGameSchemaAdvisoryXactLock, GamePrisma } from '@sammo-ts/infra';
-import {
-    ActionLogger,
-    ItemLoader,
-    LogFormat,
-    buildAuctionAlias,
-    isItemKey,
-    resolveUniqueConfig,
-} from '@sammo-ts/logic';
+import { ActionLogger, ItemLoader, LogFormat, buildAuctionAlias, isItemKey } from '@sammo-ts/logic';
+import { resolveLegacyCompatibleUniqueConfig } from '@sammo-ts/logic/rewards/legacyUniqueItemPool.js';
 
 import type { TurnDaemonCommand, TurnDaemonCommandResult } from '../lifecycle/types.js';
 import type { InMemoryTurnWorld } from '../turn/inMemoryWorld.js';
@@ -147,7 +141,8 @@ const openUniqueAuction = async (
         return fail(`최소 경매 금액은 ${minimumPoint}입니다.`);
     }
 
-    const item = await new ItemLoader().load(itemKey).catch(() => null);
+    const itemLoader = new ItemLoader();
+    const item = await itemLoader.load(itemKey).catch(() => null);
     if (!item) {
         return fail('아이템 정보를 불러올 수 없습니다.');
     }
@@ -156,7 +151,7 @@ const openUniqueAuction = async (
     }
     const currentSlotItem = general.role.items[item.slot];
     if (currentSlotItem && currentSlotItem !== 'None' && isItemKey(currentSlotItem)) {
-        const currentItem = await new ItemLoader().load(currentSlotItem).catch(() => null);
+        const currentItem = await itemLoader.load(currentSlotItem).catch(() => null);
         if (currentItem && !currentItem.buyable) {
             return fail('이미 가진 아이템이 있습니다.');
         }
@@ -189,7 +184,7 @@ const openUniqueAuction = async (
         return fail('아직 경매가 끝나지 않았습니다.');
     }
 
-    const uniqueConfig = resolveUniqueConfig(configConst);
+    const uniqueConfig = await resolveLegacyCompatibleUniqueConfig(configConst, itemLoader);
     const configuredAmount = uniqueConfig.allItems[item.slot]?.[itemKey] ?? 0;
     const occupiedAmount = world
         .listGenerals()
diff --git a/app/game-frontend/src/views/InheritView.vue b/app/game-frontend/src/views/InheritView.vue
index 9c19c201..4aeb761d 100644
--- a/app/game-frontend/src/views/InheritView.vue
+++ b/app/game-frontend/src/views/InheritView.vue
@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { formatServerDateTime } from '@sammo-ts/common';
+import { formatServerDateTime, JosaUtil } from '@sammo-ts/common';
 import { computed, onMounted, reactive, ref } from 'vue';
 import { trpc } from '../utils/trpc';
 
@@ -379,7 +379,8 @@ const buyRandomUnique = async () => {
 };
 
 const openUniqueAuction = async () => {
-    if (!uniqueForm.itemId.trim()) {
+    const selectedItem = status.value?.availableUnique.find((item) => item.key === uniqueForm.itemId.trim());
+    if (!selectedItem) {
         actionError.value = '유니크를 선택해주세요.';
         return;
     }
@@ -388,15 +389,20 @@ const openUniqueAuction = async () => {
         actionError.value = '입찰 포인트를 입력해주세요.';
         return;
     }
-    if (!window.confirm(`유니크 경매를 ${amount} 포인트로 신청하시겠습니까?`)) {
+    if (previousPoint.value < amount) {
+        actionError.value = '유산 포인트가 부족합니다.';
+        return;
+    }
+    const itemJosa = JosaUtil.pick(selectedItem.rawName, '을');
+    if (!window.confirm(`${amount} 포인트로 ${selectedItem.name}${itemJosa} 입찰하겠습니까?`)) {
         return;
     }
     await runAction(async () => {
         await trpc.inherit.openUniqueAuction.mutate({
-            itemId: uniqueForm.itemId.trim(),
+            itemId: selectedItem.key,
             amount,
         });
-    });
+    }, '성공했습니다. 경매장을 확인해주세요.');
 };
 
 const checkOwner = async () => {
diff --git a/packages/logic/src/rewards/legacyUniqueItemPool.ts b/packages/logic/src/rewards/legacyUniqueItemPool.ts
index b6f866d9..00835f14 100644
--- a/packages/logic/src/rewards/legacyUniqueItemPool.ts
+++ b/packages/logic/src/rewards/legacyUniqueItemPool.ts
@@ -1,5 +1,6 @@
+import { createItemModuleRegistry, ItemLoader, ITEM_KEYS, loadItemModules } from '@sammo-ts/logic/items/index.js';
 import type { ItemModule } from '@sammo-ts/logic/items/types.js';
-import type { UniqueItemPool } from './uniqueLottery.js';
+import { resolveUniqueConfig, type UniqueItemPool, type UniqueLotteryConfig } from './uniqueLottery.js';
 
 const LEGACY_UNIQUE_ITEM_KEYS: Readonly<Record<ItemModule['slot'], readonly string[]>> = {
     horse: [
@@ -125,3 +126,38 @@ export const buildLegacyDefaultUniqueItemPool = (itemRegistry: Map<string, ItemM
     }
     return pool;
 };
+
+let legacyDefaultUniqueItemPoolPromise: Promise<UniqueItemPool> | null = null;
+
+const cloneUniqueItemPool = (pool: UniqueItemPool): UniqueItemPool =>
+    Object.fromEntries(Object.entries(pool).map(([slot, entries]) => [slot, { ...entries }]));
+
+export const loadLegacyDefaultUniqueItemPool = async (loader?: ItemLoader): Promise<UniqueItemPool> => {
+    if (loader) {
+        const modules = await loadItemModules([...ITEM_KEYS], loader);
+        return buildLegacyDefaultUniqueItemPool(createItemModuleRegistry(modules));
+    }
+
+    legacyDefaultUniqueItemPoolPromise ??= loadItemModules([...ITEM_KEYS], new ItemLoader()).then((modules) =>
+        buildLegacyDefaultUniqueItemPool(createItemModuleRegistry(modules))
+    );
+    return cloneUniqueItemPool(await legacyDefaultUniqueItemPoolPromise);
+};
+
+/**
+ * Ref의 GameConst 기본값은 시나리오가 allItems를 덮어쓰지 않아도 항상 존재합니다.
+ * 오래된 Core snapshot의 생략값/문자열 빈 객체도 같은 기본 풀로 해석합니다.
+ */
+export const resolveLegacyCompatibleUniqueConfig = async (
+    configConst: Record<string, unknown>,
+    loader?: ItemLoader
+): Promise<UniqueLotteryConfig> => {
+    const config = resolveUniqueConfig(configConst);
+    if (Object.keys(config.allItems).length > 0) {
+        return config;
+    }
+    return {
+        ...config,
+        allItems: await loadLegacyDefaultUniqueItemPool(loader),
+    };
+};
diff --git a/packages/logic/test/legacyUniqueItemPool.test.ts b/packages/logic/test/legacyUniqueItemPool.test.ts
new file mode 100644
index 00000000..6d339e3a
--- /dev/null
+++ b/packages/logic/test/legacyUniqueItemPool.test.ts
@@ -0,0 +1,30 @@
+import { describe, expect, it } from 'vitest';
+
+import { resolveLegacyCompatibleUniqueConfig } from '../src/rewards/legacyUniqueItemPool.js';
+
+describe('legacy-compatible unique item pool', () => {
+    it.each([undefined, {}, '{}'] as const)('restores the Ref default pool when allItems is %j', async (allItems) => {
+        const config = await resolveLegacyCompatibleUniqueConfig(allItems === undefined ? {} : { allItems });
+
+        expect(Object.keys(config.allItems)).toEqual(['horse', 'weapon', 'book', 'item']);
+        expect(config.allItems.weapon?.che_무기_12_칠성검).toBe(2);
+        expect(config.allItems.item?.che_의술_청낭서).toBe(1);
+        expect(config.allItems.weapon?.che_무기_01_단도).toBeUndefined();
+    });
+
+    it('preserves an explicit scenario pool, including its counts', async () => {
+        const config = await resolveLegacyCompatibleUniqueConfig({
+            allItems: {
+                weapon: {
+                    che_무기_12_칠성검: 7,
+                },
+            },
+        });
+
+        expect(config.allItems).toEqual({
+            weapon: {
+                che_무기_12_칠성검: 7,
+            },
+        });
+    });
+});
diff --git a/tools/frontend-legacy-parity/inheritance-management.spec.ts b/tools/frontend-legacy-parity/inheritance-management.spec.ts
index 3758c333..2546e890 100644
--- a/tools/frontend-legacy-parity/inheritance-management.spec.ts
+++ b/tools/frontend-legacy-parity/inheritance-management.spec.ts
@@ -87,6 +87,12 @@ const statusFixture = {
             rawName: '칠성검',
             info: '무력을 올려주는 유니크 무기입니다.',
         },
+        {
+            key: 'che_서적_07_논어',
+            name: '논어(+7)',
+            rawName: '논어',
+            info: '지력을 올려주는 유니크 서적입니다.',
+        },
     ],
     availableTargetGenerals: [{ id: 8, name: '조조' }],
     turnTimeZones: ['00:00'],
@@ -98,6 +104,7 @@ const statusFixture = {
 const installFixture = async (page: Page, options: { failBuff?: boolean } = {}) => {
     let buffMutationCount = 0;
     let resetTurnMutationCount = 0;
+    const uniqueAuctionRequests: unknown[] = [];
     await installImages(page);
     await page.addInitScript(() => {
         window.localStorage.setItem('sammo-game-token', 'ga_inherit-visual-token');
@@ -105,6 +112,7 @@ const installFixture = async (page: Page, options: { failBuff?: boolean } = {})
     });
     await page.route('**/che/api/trpc/**', async (route) => {
         const names = operations(route);
+        const requestBody: unknown = route.request().postData() ? route.request().postDataJSON() : null;
         if (options.failBuff && names.includes('inherit.buyHiddenBuff')) {
             await route.fulfill({
                 status: 500,
@@ -145,6 +153,10 @@ const installFixture = async (page: Page, options: { failBuff?: boolean } = {})
                 resetTurnMutationCount += 1;
                 return response({ ok: true, nextTurnTimeBase: 302.5143852464758, nextTurnTimeLabel: '00:05' });
             }
+            if (name === 'inherit.openUniqueAuction') {
+                uniqueAuctionRequests.push(requestBody);
+                return response({ ok: true, auctionId: 31, closeAt: '2026-07-27T00:00:00.000Z' });
+            }
             throw new Error(`Unhandled inheritance fixture operation: ${name}`);
         });
         await route.fulfill({
@@ -156,6 +168,7 @@ const installFixture = async (page: Page, options: { failBuff?: boolean } = {})
     return {
         buffMutationCount: () => buffMutationCount,
         resetTurnMutationCount: () => resetTurnMutationCount,
+        uniqueAuctionRequests,
     };
 };
 
@@ -290,6 +303,28 @@ test.describe('inheritance management legacy parity', () => {
         await expect(page.locator('#inherit_previous_value')).toHaveValue('12,000');
     });
 
+    test('selects a Ref default unique and starts its auction from the inheritance page', async ({ page }) => {
+        const fixture = await installFixture(page);
+        await page.goto(gameUrl);
+
+        await page.locator('#specific-unique').selectOption('che_서적_07_논어');
+        await page.locator('#specific-unique-amount').fill('6000');
+        page.once('dialog', async (dialog) => {
+            expect(dialog.message()).toBe('6000 포인트로 논어(+7)를 입찰하겠습니까?');
+            await dialog.accept();
+        });
+        await page
+            .locator('.shop-item')
+            .filter({ has: page.locator('#specific-unique') })
+            .getByRole('button', { name: '경매 시작' })
+            .click();
+
+        await expect.poll(() => fixture.uniqueAuctionRequests.length).toBe(1);
+        expect(JSON.stringify(fixture.uniqueAuctionRequests[0])).toContain('che_서적_07_논어');
+        expect(JSON.stringify(fixture.uniqueAuctionRequests[0])).toContain('6000');
+        await expect(page.locator('.notice.success')).toHaveText('성공했습니다. 경매장을 확인해주세요.');
+    });
+
     test('keeps controls usable and renders an API mutation error', async ({ page }) => {
         await installFixture(page, { failBuff: true });
         page.on('dialog', (dialog) => dialog.accept());
diff --git a/tools/integration-tests/test/auctionFlow.test.ts b/tools/integration-tests/test/auctionFlow.test.ts
index 13232b65..e111fa96 100644
--- a/tools/integration-tests/test/auctionFlow.test.ts
+++ b/tools/integration-tests/test/auctionFlow.test.ts
@@ -26,15 +26,8 @@ import {
     resolveRedisConfigFromEnv,
     GamePrisma,
 } from '@sammo-ts/infra';
-import {
-    buildNeutralResourceAuctionPlan,
-    ItemLoader,
-    ITEM_KEYS,
-} from '@sammo-ts/logic';
-import {
-    createItemInventoryFromSlots,
-    serializeItemInventory,
-} from '@sammo-ts/logic/items/inventory.js';
+import { buildNeutralResourceAuctionPlan, ItemLoader, ITEM_KEYS } from '@sammo-ts/logic';
+import { createItemInventoryFromSlots, serializeItemInventory } from '@sammo-ts/logic/items/inventory.js';
 
 const sleep = (ms: number) => new Promise((resolve) => setTimeout(resolve, ms));
 const workspaceRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '../../..');
@@ -301,6 +294,7 @@ describe('auction integration flow', () => {
             databaseUrl: resolvePostgresConfigFromEnv({ schema: 'che' }).url,
             adminUser: bootstrap.user,
             installOptions: {
+                serverId: 'auction-integration-908',
                 turnTermMinutes: 1,
                 sync: false,
                 fiction: 0,
@@ -676,6 +670,69 @@ describe('auction integration flow', () => {
         turnDaemonLoop = turnDaemon.lifecycle.start();
         await sleep(500);
 
+        const directTransport = new DatabaseTurnDaemonTransport(prisma, 30_000);
+        await expect(
+            directTransport.requestCommand(
+                {
+                    type: 'auctionBid',
+                    auctionId: auction.id,
+                    generalId: validBidder.generalId,
+                    amount: 400,
+                },
+                30_000
+            )
+        ).resolves.toMatchObject({
+            type: 'auctionBid',
+            ok: false,
+            reason: '이미 다른 유니크를 가지고 있습니다.',
+        });
+
+        const siblingCloseAt = new Date(turnDaemon.world.getGameNow(new Date()).getTime() + 10 * 60_000);
+        const siblingAuction = await prisma.auction.create({
+            data: {
+                type: 'UNIQUE_ITEM',
+                targetCode: uniquePair.keyB,
+                hostGeneralId: 0,
+                hostName: '시스템',
+                detail: {
+                    startBidAmount: 200,
+                    isReverse: false,
+                    availableLatestBidCloseDate: siblingCloseAt.toISOString(),
+                },
+                status: 'OPEN',
+                closeAt: siblingCloseAt,
+                closeTick: BigInt(turnDaemon.world.dateToGameTick(siblingCloseAt)),
+            },
+        });
+        await prisma.auctionBid.create({
+            data: {
+                auctionId: siblingAuction.id,
+                generalId: spareBidder.generalId,
+                amount: 350,
+                eventId: `same-slot-race-${siblingAuction.id}`,
+                eventAt: turnDaemon.world.getGameNow(new Date()),
+            },
+        });
+        await expect(
+            directTransport.requestCommand(
+                {
+                    type: 'auctionBid',
+                    auctionId: auction.id,
+                    generalId: spareBidder.generalId,
+                    amount: 400,
+                },
+                30_000
+            )
+        ).resolves.toMatchObject({
+            type: 'auctionBid',
+            ok: false,
+            reason: '1순위 입찰자인 경매중에 같은 부위가 있습니다.',
+        });
+        await prisma.auction.update({
+            where: { id: siblingAuction.id },
+            data: { status: 'CANCELED', finishedAt: new Date() },
+        });
+
         const finalizeAt = new Date(turnDaemon!.world.getGameNow(new Date()).getTime() - 1000);
         const finalizeTick = turnDaemon!.world.dateToGameTick(finalizeAt);
         await prisma.auction.update({
@@ -684,7 +741,6 @@ describe('auction integration flow', () => {
         });
         await redis.zAdd(keys.timerKey, [{ score: finalizeTick, value: String(auction.id) }]);
 
-        const transport = new DatabaseTurnDaemonTransport(prisma, 30_000);
         await prisma.$executeRaw(
             GamePrisma.sql`
                 UPDATE auction
@@ -694,15 +750,16 @@ describe('auction integration flow', () => {
                 WHERE id = ${auction.id}
             `
         );
-        const result = await transport.requestCommand({ type: 'auctionFinalize', auctionId: auction.id }, 30_000);
+        const result = await directTransport.requestCommand({ type: 'auctionFinalize', auctionId: auction.id }, 30_000);
         expect(result).toMatchObject({ type: 'auctionFinalize', ok: false });
 
         const reopened = await prisma.auction.findUnique({
             where: { id: auction.id },
             select: { status: true, closeAt: true },
         });
-        expect(reopened?.status).toBe('OPEN');
-        expect(reopened?.closeAt.getTime()).toBeGreaterThan(finalizeAt.getTime());
+        expect(reopened).not.toBeNull();
+        expect(reopened!.status).toBe('OPEN');
+        expect(reopened!.closeAt.getTime() - finalizeAt.getTime()).toBe(24 * 60_000);
     }, 60_000);
 
     it('unique auction: two bidders extend until limit, then winner gets item', async () => {
@@ -1013,4 +1070,154 @@ describe('auction integration flow', () => {
             meta: expect.objectContaining({ neutralAuctionRegistrationKey: '180-02' }),
         });
     }, 60_000);
+
+    it('starts from inheritance, accepts another user bid, and awards a default-pool unique', async () => {
+        if (!gameConnector || !redisConnector || !gameServer) {
+            throw new Error('runtime not ready');
+        }
+        const prisma = gameConnector.prisma;
+        const redis = redisConnector.client;
+        const [host, bidder] = userSessions;
+        if (!host || !bidder) {
+            throw new Error('not enough bidders');
+        }
+
+        if (turnDaemon) {
+            await turnDaemon.lifecycle.stop('integration-test');
+            await turnDaemon.close();
+            await turnDaemonLoop;
+        }
+
+        const uniquePair = await findUniqueItemPair();
+        const slotField = resolveSlotField(uniquePair.slot);
+        if (!slotField) {
+            throw new Error('unsupported item slot');
+        }
+        const state = await prisma.worldState.findFirstOrThrow();
+        const config =
+            state.config && typeof state.config === 'object' && !Array.isArray(state.config) ? state.config : {};
+        const configConst =
+            config.const && typeof config.const === 'object' && !Array.isArray(config.const) ? config.const : {};
+        await prisma.worldState.update({
+            where: { id: state.id },
+            data: {
+                currentYear: 180,
+                currentMonth: 4,
+                config: {
+                    ...config,
+                    const: {
+                        ...configConst,
+                        // 표준 Ref 시나리오는 GameConst 기본값을 상속한다. 오래된
+                        // Core snapshot의 문자열 빈 객체도 같은 입력으로 검증한다.
+                        allItems: '{}',
+                    },
+                },
+            },
+        });
+        await prisma.auction.updateMany({
+            where: { type: 'UNIQUE_ITEM', status: { in: ['OPEN', 'FINALIZING'] } },
+            data: { status: 'CANCELED', finishedAt: new Date() },
+        });
+
+        for (const session of [host, bidder]) {
+            const row = await prisma.general.findUniqueOrThrow({
+                where: { id: session.generalId },
+                select: { meta: true },
+            });
+            const meta = row.meta && typeof row.meta === 'object' && !Array.isArray(row.meta) ? row.meta : {};
+            await prisma.general.update({
+                where: { id: session.generalId },
+                data: {
+                    weaponCode: 'None',
+                    bookCode: 'None',
+                    horseCode: 'None',
+                    itemCode: 'None',
+                    meta: {
+                        ...meta,
+                        itemInventory: serializeItemInventory(
+                            createItemInventoryFromSlots({ horse: null, weapon: null, book: null, item: null })
+                        ),
+                    },
+                },
+            });
+            await prisma.inheritancePoint.upsert({
+                where: { userId_key: { userId: session.userId, key: 'previous' } },
+                update: { value: 100_000 },
+                create: { userId: session.userId, key: 'previous', value: 100_000 },
+            });
+        }
+        await prisma.general.updateMany({
+            where: { [slotField]: uniquePair.keyA } as GamePrisma.GeneralWhereInput,
+            data: { [slotField]: 'None' } as GamePrisma.GeneralUpdateManyMutationInput,
+        });
+
+        const gameDatabaseUrl = resolvePostgresConfigFromEnv({ schema: 'che' }).url;
+        const gatewayDatabaseUrl = resolvePostgresConfigFromEnv({ schema: 'public' }).url;
+        turnDaemon = await createTurnDaemonRuntime({
+            profile: 'che',
+            profileName: 'che:908',
+            databaseUrl: gameDatabaseUrl,
+            gatewayDatabaseUrl,
+        });
+        turnDaemonLoop = turnDaemon.lifecycle.start();
+        await sleep(500);
+
+        const hostClient = createGameClient(gameUrl, gameServer.config.trpcPath, { value: host.accessToken });
+        const bidderClient = createGameClient(gameUrl, gameServer.config.trpcPath, { value: bidder.accessToken });
+        const inheritStatus = await hostClient.inherit.getStatus.query();
+        expect(inheritStatus.availableUnique.length).toBeGreaterThan(80);
+        expect(inheritStatus.availableUnique).toEqual(
+            expect.arrayContaining([expect.objectContaining({ key: uniquePair.keyA })])
+        );
+
+        const opened = await hostClient.inherit.openUniqueAuction.mutate({
+            itemId: uniquePair.keyA,
+            amount: 5_000,
+        });
+        const auction = await prisma.auction.findUniqueOrThrow({ where: { id: opened.auctionId } });
+        expect(auction).toMatchObject({
+            type: 'UNIQUE_ITEM',
+            targetCode: uniquePair.keyA,
+            hostGeneralId: host.generalId,
+            status: 'OPEN',
+        });
+        const timerKeys = buildAuctionTimerKeys(gameServer.config.profileName);
+        await expect(redis.zScore(timerKeys.timerKey, String(auction.id))).resolves.not.toBeNull();
+
+        await bidderClient.auction.bidUnique.mutate({ auctionId: auction.id, amount: 5_100 });
+        await expect(
+            prisma.inheritancePoint.findUniqueOrThrow({
+                where: { userId_key: { userId: host.userId, key: 'previous' } },
+            })
+        ).resolves.toMatchObject({ value: 100_000 });
+
+        const finalizeAt = new Date(turnDaemon.world.getGameNow(new Date()).getTime() - 1_000);
+        const finalizeTick = turnDaemon.world.dateToGameTick(finalizeAt);
+        await prisma.auction.update({
+            where: { id: auction.id },
+            data: {
+                closeAt: finalizeAt,
+                closeTick: BigInt(finalizeTick),
+                status: 'FINALIZING',
+                finalizingAt: new Date(),
+            },
+        });
+        const transport = new DatabaseTurnDaemonTransport(prisma, 30_000);
+        const result = await transport.requestCommand({ type: 'auctionFinalize', auctionId: auction.id }, 30_000);
+        expect(result).toMatchObject({ type: 'auctionFinalize', ok: true });
+
+        await expect(prisma.auction.findUniqueOrThrow({ where: { id: auction.id } })).resolves.toMatchObject({
+            status: 'FINISHED',
+        });
+        const winner = await prisma.general.findUniqueOrThrow({
+            where: { id: bidder.generalId },
+            select: { weaponCode: true, bookCode: true, horseCode: true, itemCode: true },
+        });
+        expect(Object.values(winner)).toContain(uniquePair.keyA);
+        await expect(
+            prisma.inheritancePoint.findUniqueOrThrow({
+                where: { userId_key: { userId: bidder.userId, key: 'previous' } },
+            })
+        ).resolves.toMatchObject({ value: 94_900 });
+    }, 60_000);
 });