diff --git a/lib/src/core/model/arena_match.dart b/lib/src/core/model/arena_match.dart
new file mode 100644
index 0000000..98e401f
--- /dev/null
+++ b/lib/src/core/model/arena_match.dart
@@ -0,0 +1,111 @@
+import 'package:asciineverdie/src/core/model/equipment_slot.dart';
+import 'package:asciineverdie/src/core/model/hall_of_fame.dart';
+
+/// 아레나 대전 정보
+///
+/// 도전자와 상대의 정보, 베팅 슬롯을 포함
+class ArenaMatch {
+  const ArenaMatch({
+    required this.challenger,
+    required this.opponent,
+    required this.bettingSlot,
+  });
+
+  /// 도전자 (내 캐릭터)
+  final HallOfFameEntry challenger;
+
+  /// 상대 캐릭터
+  final HallOfFameEntry opponent;
+
+  /// 베팅 슬롯 (같은 슬롯 교환)
+  final EquipmentSlot bettingSlot;
+
+  /// 도전자 순위
+  int get challengerRank => 0; // ArenaService에서 계산
+
+  /// 상대 순위
+  int get opponentRank => 0; // ArenaService에서 계산
+}
+
+/// 아레나 대전 결과
+class ArenaMatchResult {
+  const ArenaMatchResult({
+    required this.match,
+    required this.isVictory,
+    required this.turns,
+    required this.updatedChallenger,
+    required this.updatedOpponent,
+  });
+
+  /// 대전 정보
+  final ArenaMatch match;
+
+  /// 도전자 승리 여부
+  final bool isVictory;
+
+  /// 전투 턴 수
+  final int turns;
+
+  /// 장비 교환 후 업데이트된 도전자
+  final HallOfFameEntry updatedChallenger;
+
+  /// 장비 교환 후 업데이트된 상대
+  final HallOfFameEntry updatedOpponent;
+}
+
+/// 아레나 전투 턴 (애니메이션용)
+class ArenaCombatTurn {
+  ArenaCombatTurn({
+    this.challengerDamage,
+    this.opponentDamage,
+    required this.challengerHp,
+    required this.opponentHp,
+    required this.challengerHpMax,
+    required this.opponentHpMax,
+    this.isChallengerCritical = false,
+    this.isOpponentCritical = false,
+    this.isChallengerEvaded = false,
+    this.isOpponentEvaded = false,
+    this.isChallengerBlocked = false,
+    this.isOpponentBlocked = false,
+  }) : timestamp = DateTime.now().microsecondsSinceEpoch;
+
+  /// 턴 식별용 타임스탬프
+  final int timestamp;
+
+  /// 도전자가 입힌 데미지 (null이면 공격 안 함)
+  final int? challengerDamage;
+
+  /// 상대가 입힌 데미지 (null이면 공격 안 함)
+  final int? opponentDamage;
+
+  /// 도전자 현재 HP
+  final int challengerHp;
+
+  /// 상대 현재 HP
+  final int opponentHp;
+
+  /// 도전자 최대 HP
+  final int challengerHpMax;
+
+  /// 상대 최대 HP
+  final int opponentHpMax;
+
+  /// 도전자 크리티컬 여부
+  final bool isChallengerCritical;
+
+  /// 상대 크리티컬 여부
+  final bool isOpponentCritical;
+
+  /// 도전자 회피 여부
+  final bool isChallengerEvaded;
+
+  /// 상대 회피 여부
+  final bool isOpponentEvaded;
+
+  /// 도전자 블록 여부
+  final bool isChallengerBlocked;
+
+  /// 상대 블록 여부
+  final bool isOpponentBlocked;
+}
diff --git a/lib/src/core/model/hall_of_fame.dart b/lib/src/core/model/hall_of_fame.dart
index 28855b6..9ee0b38 100644
--- a/lib/src/core/model/hall_of_fame.dart
+++ b/lib/src/core/model/hall_of_fame.dart
@@ -1,5 +1,7 @@
+import 'package:asciineverdie/src/core/engine/item_service.dart';
 import 'package:asciineverdie/src/core/model/combat_stats.dart';
 import 'package:asciineverdie/src/core/model/equipment_item.dart';
+import 'package:asciineverdie/src/core/model/equipment_slot.dart';
 import 'package:asciineverdie/src/core/model/game_state.dart';
 
 /// 명예의 전당 엔트리 (Phase 10: Hall of Fame Entry)
@@ -80,6 +82,39 @@ class HallOfFameEntry {
         '${clearedAt.day.toString().padLeft(2, '0')}';
   }
 
+  /// copyWith 메서드 (아레나 장비 교환용)
+  HallOfFameEntry copyWith({
+    String? id,
+    String? characterName,
+    String? race,
+    String? klass,
+    int? level,
+    int? totalPlayTimeMs,
+    int? totalDeaths,
+    int? monstersKilled,
+    int? questsCompleted,
+    DateTime? clearedAt,
+    CombatStats? finalStats,
+    List<EquipmentItem>? finalEquipment,
+    List<Map<String, String>>? finalSpells,
+  }) {
+    return HallOfFameEntry(
+      id: id ?? this.id,
+      characterName: characterName ?? this.characterName,
+      race: race ?? this.race,
+      klass: klass ?? this.klass,
+      level: level ?? this.level,
+      totalPlayTimeMs: totalPlayTimeMs ?? this.totalPlayTimeMs,
+      totalDeaths: totalDeaths ?? this.totalDeaths,
+      monstersKilled: monstersKilled ?? this.monstersKilled,
+      questsCompleted: questsCompleted ?? this.questsCompleted,
+      clearedAt: clearedAt ?? this.clearedAt,
+      finalStats: finalStats ?? this.finalStats,
+      finalEquipment: finalEquipment ?? this.finalEquipment,
+      finalSpells: finalSpells ?? this.finalSpells,
+    );
+  }
+
   /// GameState에서 HallOfFameEntry 생성
   factory HallOfFameEntry.fromGameState({
     required GameState state,
@@ -181,6 +216,22 @@ class HallOfFame {
   /// 비어있는지 확인
   bool get isEmpty => entries.isEmpty;
 
+  /// ID로 엔트리 조회
+  HallOfFameEntry? findById(String id) {
+    for (final entry in entries) {
+      if (entry.id == id) return entry;
+    }
+    return null;
+  }
+
+  /// 엔트리 업데이트 (아레나 장비 교환 후)
+  HallOfFame updateEntry(HallOfFameEntry updated) {
+    final newEntries = entries.map((e) {
+      return e.id == updated.id ? updated : e;
+    }).toList();
+    return HallOfFame(entries: newEntries);
+  }
+
   /// JSON으로 직렬화
   Map<String, dynamic> toJson() {
     return {'entries': entries.map((e) => e.toJson()).toList()};
@@ -196,3 +247,70 @@ class HallOfFame {
     );
   }
 }
+
+/// 아레나 순위 관련 extension
+extension HallOfFameArenaX on HallOfFame {
+  /// 아레나 점수 계산
+  ///
+  /// 점수 = (레벨 × 100) + 장비점수 + (전투력 / 10)
+  static int calculateArenaScore(HallOfFameEntry entry) {
+    // 1. 레벨 점수 (주요 지표)
+    final levelScore = entry.level * 100;
+
+    // 2. 장비 점수 (전체 슬롯 합계)
+    final equipScore = entry.finalEquipment?.fold<int>(
+          0,
+          (sum, item) => sum + ItemService.calculateEquipmentScore(item),
+        ) ??
+        0;
+
+    // 3. 전투력 점수 (ATK + DEF + HP/10)
+    final combatScore = entry.finalStats != null
+        ? (entry.finalStats!.atk +
+            entry.finalStats!.def +
+            entry.finalStats!.hpMax ~/ 10)
+        : 0;
+
+    return levelScore + equipScore + (combatScore ~/ 10);
+  }
+
+  /// 아레나 점수 기준 정렬된 엔트리 반환
+  List<HallOfFameEntry> get rankedEntries {
+    final sorted = List<HallOfFameEntry>.from(entries)
+      ..sort((a, b) {
+        final scoreA = calculateArenaScore(a);
+        final scoreB = calculateArenaScore(b);
+        if (scoreA != scoreB) return scoreB.compareTo(scoreA);
+        // 동점일 경우 먼저 클리어한 캐릭터가 상위
+        return a.clearedAt.compareTo(b.clearedAt);
+      });
+    return sorted;
+  }
+
+  /// 특정 캐릭터의 순위 반환 (1-based)
+  int getRank(String characterId) {
+    final ranked = rankedEntries;
+    for (var i = 0; i < ranked.length; i++) {
+      if (ranked[i].id == characterId) return i + 1;
+    }
+    return -1;
+  }
+
+  /// 상대의 베팅 슬롯 결정 (최저 장비 점수 슬롯)
+  static EquipmentSlot findWeakestSlot(HallOfFameEntry entry) {
+    final equipment = entry.finalEquipment ?? [];
+    if (equipment.isEmpty) return EquipmentSlot.weapon;
+
+    EquipmentItem weakest = equipment.first;
+    int lowestScore = ItemService.calculateEquipmentScore(weakest);
+
+    for (final item in equipment) {
+      final score = ItemService.calculateEquipmentScore(item);
+      if (score < lowestScore) {
+        lowestScore = score;
+        weakest = item;
+      }
+    }
+    return weakest.slot;
+  }
+}
diff --git a/lib/src/core/model/monster_combat_stats.dart b/lib/src/core/model/monster_combat_stats.dart
index 8eef0d6..5dcc0c2 100644
--- a/lib/src/core/model/monster_combat_stats.dart
+++ b/lib/src/core/model/monster_combat_stats.dart
@@ -1,3 +1,4 @@
+import 'package:asciineverdie/src/core/model/combat_stats.dart';
 import 'package:asciineverdie/src/core/util/balance_constants.dart';
 
 /// 몬스터 공격 속도 타입
@@ -238,4 +239,25 @@ class MonsterCombatStats {
     attackDelayMs: 1000,
     expReward: 15,
   );
+
+  /// CombatStats에서 MonsterCombatStats 생성 (아레나 PvP용)
+  ///
+  /// 플레이어의 CombatStats를 몬스터 형태로 변환하여
+  /// 기존 CombatCalculator를 재사용할 수 있게 함.
+  factory MonsterCombatStats.fromCombatStats(CombatStats stats, String name) {
+    return MonsterCombatStats(
+      name: name,
+      level: 0, // PvP에서는 레벨 페널티 없음
+      atk: stats.atk,
+      def: stats.def,
+      hpMax: stats.hpMax,
+      hpCurrent: stats.hpMax, // 풀 HP로 시작
+      criRate: stats.criRate,
+      criDamage: stats.criDamage,
+      evasion: stats.evasion,
+      accuracy: stats.accuracy,
+      attackDelayMs: stats.attackDelayMs,
+      expReward: 0, // PvP에서는 경험치 없음
+    );
+  }
 }