diff --git a/hwe/sammo/Auction.php b/hwe/sammo/Auction.php
index e390cee5..c4fc69d6 100644
--- a/hwe/sammo/Auction.php
+++ b/hwe/sammo/Auction.php
@@ -17,7 +17,7 @@ use sammo\VO\InheritancePointType;
 class Auction
 {
 
-  private AuctionInfo $info;
+  protected AuctionInfo $info;
   public const LAST_AUCTION_ID_KEY = 'last_auction_id';
 
   static public function genNextAuctionID(): int
@@ -55,7 +55,7 @@ class Auction
     $auctionStor->setValue("id_{$auctionID}", $info->toArray());
   }
 
-  public function getHighestBid(): AuctionBidItem
+  public function getHighestBid(): ?AuctionBidItem
   {
     $db = DB::db();
     $rawHighestBid = $db->queryFirstRow(
@@ -63,7 +63,7 @@ class Auction
       $this->info->id
     );
     if(!$rawHighestBid){
-      throw new \Exception('입찰이 없습니다.');
+      return null;
     }
 
     return AuctionBidItem::fromArray($rawHighestBid);
@@ -83,7 +83,7 @@ class Auction
     return AuctionBidItem::fromArray($rawMyPrevBid);
   }
 
-  public function __construct(private readonly int $auctionID, private General $general)
+  public function __construct(protected readonly int $auctionID, protected General $general)
   {
     $db = DB::db();
     $auctionStor = KVStorage::getStorage($db, 'auction');
@@ -166,7 +166,11 @@ class Auction
       $this->general->setAuxVar('openedAuction', $openedAuction);
     }
     if ($isRollback) {
-      $this->refundBid($this->getHighestBid(), "{$this->info->title} 경매가 취소되었습니다.");
+      $highestBid = $this->getHighestBid();
+      if($highestBid !== null){
+        $this->refundBid($highestBid, "{$this->info->title} 경매가 취소되었습니다.");
+      }
+
     }
     $auctionID = $this->info->id;
     $auctionStor->setValue("id_{$auctionID}", $this->info->toArray());
@@ -180,7 +184,7 @@ class Auction
     $general = $this->general;
 
     $highestBid = $this->getHighestBid();
-    if ($amount <= $highestBid->amount) {
+    if ($highestBid !== null && $amount <= $highestBid->amount) {
       throw new \RuntimeException('현재입찰가보다 높게 입찰해야 합니다.');
     }
 
@@ -220,7 +224,7 @@ class Auction
     $general->increaseInheritancePoint(InheritanceKey::previous, -$morePoint);
     $general->increaseRankVar(RankColumn::inherit_point_spent_dynamic, $morePoint);
 
-    if ($myPrevBid === null || $myPrevBid->id !== $highestBid->id) {
+    if ($myPrevBid === null || ($highestBid !== null && $myPrevBid->id !== $highestBid->id)) {
       $this->refundBid($highestBid, "{$auctionInfo->title} 경매에 상회입찰자가 나타났습니다.");
     }
     $general->applyDB($db);
@@ -257,15 +261,8 @@ class Auction
 
     $db = DB::db();
 
-    $rawHighestBid = $db->queryFirstRow(
-      'SELECT * FROM ng_auction WHERE auction_id = %i ORDER BY `amount` DESC LIMIT 1',
-      $auctionInfo->id
-    );
-    if (!$rawHighestBid) {
-      throw new \RuntimeException('최고 입찰가가 없습니다.');
-    }
-    $highestBid = AuctionBidItem::fromArray($rawHighestBid);
-    if ($amount <= $highestBid->amount) {
+    $highestBid = $this->getHighestBid();
+    if ($highestBid !== null && $amount <= $highestBid->amount) {
       throw new \RuntimeException('현재입찰가보다 높게 입찰해야 합니다.');
     }
 
@@ -300,7 +297,7 @@ class Auction
 
     $general->setVar($resType->value, $general->getVar($resType->value) - $morePoint);
 
-    if ($myPrevBid === null || $myPrevBid->id !== $highestBid->id) {
+    if ($myPrevBid === null || ($highestBid !== null && $myPrevBid->id !== $highestBid->id)) {
       $this->refundBid($highestBid, "{$auctionInfo->title} 경매에 상회입찰자가 나타났습니다.");
     }
     $general->applyDB($db);
diff --git a/hwe/sammo/AuctionUniqueItem.php b/hwe/sammo/AuctionUniqueItem.php
new file mode 100644
index 00000000..e52969d2
--- /dev/null
+++ b/hwe/sammo/AuctionUniqueItem.php
@@ -0,0 +1,95 @@
+<?php
+
+namespace sammo;
+
+use DateTimeImmutable;
+use sammo\DTO\AuctionInfo;
+use sammo\Enums\InheritanceKey;
+use sammo\Enums\ResourceType;
+use sammo\RandUtil;
+
+class AuctionUniqueItem extends Auction
+{
+
+  static public function genObfuscatedName(int $id): string
+  {
+    $db = DB::db();
+    $gameStor = KVStorage::getStorage($db, 'game_env');
+
+    $namePool = $gameStor->getValue('obfuscatedNamePool');
+    if($namePool === null){
+      $rng = new RandUtil(new LiteHashDRBG(Util::simpleSerialize(
+        UniqueConst::$hiddenSeed,
+      )));
+      $namePool = [];
+      foreach(GameConst::$randGenFirstName as $ch0){
+        foreach(GameConst::$randGenMiddleName as $ch1){
+          foreach(GameConst::$randGenLastName as $ch2){
+            $namePool[] = "{$ch0}{$ch1}{$ch2}";
+          }
+        }
+      }
+      $namePool = $rng->shuffle($namePool);
+      $gameStor->setValue('obfuscatedNamePool', $namePool);
+    }
+
+
+    $dupIdx = intdiv($id, count($namePool));
+    $subIdx = $id % count($namePool);
+    if ($dupIdx == 0) {
+      return $namePool[$subIdx];
+    }
+    return "{$namePool[$subIdx]}{$dupIdx}";
+  }
+
+  static public function openItemAuction(BaseItem $item, General $general, int $startAmount): ?string
+  {
+    if ($startAmount < GameConst::$inheritItemUniqueMinPoint) {
+      return '최소 경매 금액은 ' . GameConst::$inheritItemUniqueMinPoint . '입니다.';
+    }
+
+    if($general->getInheritancePoint(InheritanceKey::previous) < $startAmount){
+      return '경매를 시작할 포인트가 부족합니다.';
+    }
+
+    $auctionID = static::genNextAuctionID();
+    $now = new DateTimeImmutable();
+
+    $db = DB::db();
+    $gameStor = KVStorage::getStorage($db, 'game_env');
+    $turnTerm = $gameStor->getValue('turnterm');
+
+    $closeDate = $now->add(TimeUtil::secondsToDateInterval(24 * 60 * $turnTerm * 60));
+
+    $info = new AuctionInfo(
+      $auctionID,
+      static::genObfuscatedName($general->getID()),
+      $general->getID(),
+      $item->getRawClassName(),
+      "{$item->getName()} 경매",
+      false,
+      ResourceType::inheritancePoint,
+      $startAmount,
+      null,
+      $now,
+      $closeDate
+    );
+
+    $result = static::openAuction($info, $general);
+    if($result !== null){
+      return $result;
+    }
+    $auction = new static($auctionID, $general);
+    try{
+      $auction->bid($startAmount);
+    }
+    catch(\Exception $e){
+      //실패해선 안된다.
+      $msg = $e->getMessage();
+      $auction->closeAuction();
+      return "경매를 시작했지만, 첫 입찰에 실패했습니다: {$msg}";
+    }
+
+    return null;
+  }
+}
diff --git a/hwe/sammo/DTO/AuctionInfo.php b/hwe/sammo/DTO/AuctionInfo.php
index 6854ed37..c34dd50f 100644
--- a/hwe/sammo/DTO/AuctionInfo.php
+++ b/hwe/sammo/DTO/AuctionInfo.php
@@ -10,7 +10,7 @@ class AuctionInfo extends DTO
 {
 	public function __construct(
 		public int $id,
-		public int $openerName,
+		public string $openerName,
 		public int $openerGeneralID,
 		public string $type,
 		public string $title,