diff --git a/Assets/Scripts/Editor/BossEnemyEditor.cs b/Assets/Scripts/Editor/BossEnemyEditor.cs
new file mode 100644
index 00000000..42b8e458
--- /dev/null
+++ b/Assets/Scripts/Editor/BossEnemyEditor.cs
@@ -0,0 +1,314 @@
+#if UNITY_EDITOR
+using UnityEngine;
+using UnityEditor;
+using Colosseum.Enemy;
+
+namespace Colosseum.Editor
+{
+    /// <summary>
+    /// BossEnemy 커스텀 인스펙터.
+    /// 페이즈 정보, HP, 상태를 시각적으로 표시합니다.
+    /// </summary>
+    [CustomEditor(typeof(BossEnemy))]
+    public class BossEnemyEditor : UnityEditor.Editor
+    {
+        private BossEnemy boss;
+        private bool showPhaseDetails = true;
+        private bool showDebugTools = true;
+        private int selectedPhaseIndex = 0;
+
+        private void OnEnable()
+        {
+            boss = (BossEnemy)target;
+        }
+
+        public override void OnInspectorGUI()
+        {
+            // 기본 인스펙터 그리기
+            DrawDefaultInspector();
+
+            if (!Application.isPlaying)
+            {
+                EditorGUILayout.HelpBox("런타임 디버그 정보는 플레이 모드에서만 표시됩니다.", MessageType.Info);
+                return;
+            }
+
+            EditorGUILayout.Space(10);
+
+            // 상태 요약
+            DrawStatusSummary();
+
+            EditorGUILayout.Space(10);
+
+            // 페이즈 정보
+            DrawPhaseInfo();
+
+            EditorGUILayout.Space(10);
+
+            // 디버그 도구
+            DrawDebugTools();
+        }
+
+        /// <summary>
+        /// 상태 요약 표시
+        /// </summary>
+        private void DrawStatusSummary()
+        {
+            EditorGUILayout.LabelField("상태 요약", EditorStyles.boldLabel);
+            EditorGUI.indentLevel++;
+
+            // HP 바
+            float hpPercent = boss.MaxHealth > 0 ? boss.CurrentHealth / boss.MaxHealth : 0f;
+            DrawProgressBar("HP", hpPercent, GetHealthColor(hpPercent), $"{boss.CurrentHealth:F0} / {boss.MaxHealth:F0}");
+
+            // 상태 정보
+            EditorGUILayout.LabelField("현재 페이즈", $"{boss.CurrentPhaseIndex + 1} / {boss.TotalPhases}");
+            EditorGUILayout.LabelField("상태", GetStatusText());
+
+            if (boss.CurrentPhase != null)
+            {
+                EditorGUILayout.LabelField("페이즈명", boss.CurrentPhase.PhaseName);
+            }
+
+            EditorGUI.indentLevel--;
+        }
+
+        /// <summary>
+        /// 페이즈 상세 정보 표시
+        /// </summary>
+        private void DrawPhaseInfo()
+        {
+            showPhaseDetails = EditorGUILayout.Foldout(showPhaseDetails, "페이즈 상세 정보", true);
+
+            if (!showPhaseDetails)
+                return;
+
+            EditorGUI.indentLevel++;
+
+            var phasesProp = serializedObject.FindProperty("phases");
+            if (phasesProp == null || phasesProp.arraySize == 0)
+            {
+                EditorGUILayout.HelpBox("등록된 페이즈가 없습니다.", MessageType.Warning);
+                EditorGUI.indentLevel--;
+                return;
+            }
+
+            for (int i = 0; i < phasesProp.arraySize; i++)
+            {
+                var phaseProp = phasesProp.GetArrayElementAtIndex(i);
+                var phase = phaseProp.objectReferenceValue as BossPhaseData;
+
+                if (phase == null)
+                    continue;
+
+                bool isCurrentPhase = i == boss.CurrentPhaseIndex;
+                bool isCompleted = i < boss.CurrentPhaseIndex;
+
+                // 페이즈 헤더
+                GUIStyle phaseStyle = new GUIStyle(EditorStyles.foldout);
+                if (isCurrentPhase)
+                    phaseStyle.fontStyle = FontStyle.Bold;
+
+                EditorGUILayout.BeginHorizontal();
+
+                // 상태 아이콘
+                string statusIcon = isCurrentPhase ? "▶" : (isCompleted ? "✓" : "○");
+                GUIContent phaseLabel = new GUIContent($"{statusIcon} Phase {i + 1}: {phase.PhaseName}");
+
+                EditorGUILayout.LabelField(phaseLabel, GUILayout.Width(200));
+
+                // 전환 조건
+                EditorGUILayout.LabelField($"[{phase.TransitionType}]", EditorStyles.miniLabel, GUILayout.Width(100));
+
+                EditorGUILayout.EndHorizontal();
+
+                if (isCurrentPhase)
+                {
+                    EditorGUI.indentLevel++;
+                    EditorGUILayout.LabelField($"전환 조건: {GetTransitionConditionText(phase)}");
+                    EditorGUILayout.LabelField($"경과 시간: {boss.PhaseElapsedTime:F1}초");
+                    EditorGUI.indentLevel--;
+                }
+
+                EditorGUILayout.Space(2);
+            }
+
+            EditorGUI.indentLevel--;
+        }
+
+        /// <summary>
+        /// 디버그 도구 표시
+        /// </summary>
+        private void DrawDebugTools()
+        {
+            showDebugTools = EditorGUILayout.Foldout(showDebugTools, "디버그 도구", true);
+
+            if (!showDebugTools)
+                return;
+
+            EditorGUI.indentLevel++;
+
+            EditorGUILayout.HelpBox("이 도구는 서버에서만 작동합니다.", MessageType.Info);
+
+            // 페이즈 강제 전환
+            EditorGUILayout.BeginHorizontal();
+            EditorGUILayout.LabelField("페이즈 강제 전환", GUILayout.Width(120));
+            selectedPhaseIndex = EditorGUILayout.IntSlider(selectedPhaseIndex, 0, Mathf.Max(0, boss.TotalPhases - 1));
+            if (GUILayout.Button("전환", GUILayout.Width(60)))
+            {
+                if (Application.isPlaying)
+                {
+                    boss.ForcePhaseTransition(selectedPhaseIndex);
+                }
+            }
+            EditorGUILayout.EndHorizontal();
+
+            EditorGUILayout.Space(5);
+
+            // 현재 페이즈 재시작
+            if (GUILayout.Button("현재 페이즈 재시작"))
+            {
+                if (Application.isPlaying)
+                {
+                    boss.RestartCurrentPhase();
+                }
+            }
+
+            EditorGUILayout.Space(5);
+
+            // HP 조작
+            EditorGUILayout.LabelField("HP 조작", EditorStyles.boldLabel);
+            EditorGUILayout.BeginHorizontal();
+            if (GUILayout.Button("HP 10%"))
+            {
+                SetBossHP(0.1f);
+            }
+            if (GUILayout.Button("HP 30%"))
+            {
+                SetBossHP(0.3f);
+            }
+            if (GUILayout.Button("HP 50%"))
+            {
+                SetBossHP(0.5f);
+            }
+            if (GUILayout.Button("HP 100%"))
+            {
+                SetBossHP(1f);
+            }
+            EditorGUILayout.EndHorizontal();
+
+            EditorGUILayout.Space(5);
+
+            // 커스텀 조건
+            EditorGUILayout.LabelField("커스텀 조건 설정", EditorStyles.boldLabel);
+            EditorGUILayout.BeginHorizontal();
+            EditorGUILayout.LabelField("조건 ID:", GUILayout.Width(60));
+            string conditionId = EditorGUILayout.TextField("Enraged");
+            EditorGUILayout.EndHorizontal();
+
+            EditorGUILayout.BeginHorizontal();
+            if (GUILayout.Button("활성화"))
+            {
+                boss.SetCustomCondition(conditionId, true);
+            }
+            if (GUILayout.Button("비활성화"))
+            {
+                boss.SetCustomCondition(conditionId, false);
+            }
+            EditorGUILayout.EndHorizontal();
+
+            EditorGUI.indentLevel--;
+        }
+
+        /// <summary>
+        /// HP 설정 (서버에서만)
+        /// </summary>
+        private void SetBossHP(float percent)
+        {
+            if (!Application.isPlaying)
+                return;
+
+            float targetHP = boss.MaxHealth * percent;
+            float damage = boss.CurrentHealth - targetHP;
+
+            if (damage > 0)
+            {
+                boss.TakeDamage(damage);
+            }
+            else if (damage < 0)
+            {
+                boss.Heal(-damage);
+            }
+        }
+
+        /// <summary>
+        /// 진행 바 그리기
+        /// </summary>
+        private void DrawProgressBar(string label, float value, Color color, string text = "")
+        {
+            Rect rect = EditorGUILayout.GetControlRect();
+            rect.height = 20f;
+
+            // 레이블
+            Rect labelRect = new Rect(rect.x, rect.y, 60, rect.height);
+            EditorGUI.LabelField(labelRect, label);
+
+            // 바
+            Rect barRect = new Rect(rect.x + 65, rect.y, rect.width - 65, rect.height);
+            EditorGUI.DrawRect(barRect, new Color(0.2f, 0.2f, 0.2f));
+
+            Rect fillRect = new Rect(barRect.x, barRect.y, barRect.width * Mathf.Clamp01(value), barRect.height);
+            EditorGUI.DrawRect(fillRect, color);
+
+            // 텍스트
+            if (!string.IsNullOrEmpty(text))
+            {
+                GUIStyle centeredStyle = new GUIStyle(EditorStyles.label)
+                {
+                    alignment = TextAnchor.MiddleCenter
+                };
+                EditorGUI.LabelField(barRect, text, centeredStyle);
+            }
+        }
+
+        /// <summary>
+        /// HP 비율에 따른 색상 반환
+        /// </summary>
+        private Color GetHealthColor(float percent)
+        {
+            if (percent > 0.6f)
+                return new Color(0.2f, 0.8f, 0.2f); // 녹색
+            if (percent > 0.3f)
+                return new Color(0.9f, 0.7f, 0.1f); // 노란색
+            return new Color(0.9f, 0.2f, 0.2f); // 빨간색
+        }
+
+        /// <summary>
+        /// 상태 텍스트 반환
+        /// </summary>
+        private string GetStatusText()
+        {
+            if (boss.IsDead)
+                return "<color=red>사망</color>";
+            if (boss.IsTransitioning)
+                return "<color=yellow>페이즈 전환 중</color>";
+            return "<color=green>활성</color>";
+        }
+
+        /// <summary>
+        /// 전환 조건 텍스트 반환
+        /// </summary>
+        private string GetTransitionConditionText(BossPhaseData phase)
+        {
+            return phase.TransitionType switch
+            {
+                PhaseTransitionType.HealthPercent => $"HP ≤ {phase.HealthPercentThreshold * 100:F0}%",
+                PhaseTransitionType.TimeElapsed => $"시간 ≥ {phase.TimeThreshold:F0}초",
+                PhaseTransitionType.CustomCondition => $"조건: {phase.CustomConditionId}",
+                PhaseTransitionType.Manual => "수동 전환",
+                _ => "알 수 없음"
+            };
+        }
+    }
+}
+#endif
diff --git a/Assets/Scripts/Editor/BossEnemyEditor.cs.meta b/Assets/Scripts/Editor/BossEnemyEditor.cs.meta
new file mode 100644
index 00000000..e309321d
--- /dev/null
+++ b/Assets/Scripts/Editor/BossEnemyEditor.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 867ffff975b9a7a4694783f4a5ee1c6e
\ No newline at end of file
diff --git a/Assets/Scripts/Enemy/BossEnemy.cs b/Assets/Scripts/Enemy/BossEnemy.cs
new file mode 100644
index 00000000..4a5431d8
--- /dev/null
+++ b/Assets/Scripts/Enemy/BossEnemy.cs
@@ -0,0 +1,291 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+using Unity.Netcode;
+using Unity.Behavior;
+using Colosseum.Stats;
+
+namespace Colosseum.Enemy
+{
+    /// <summary>
+    /// 보스 캐릭터. 페이즈 시스템과 동적 AI 전환을 지원합니다.
+    /// Unity Behavior 패키지를 사용하여 Behavior Tree 기반 AI를 구현합니다.
+    /// </summary>
+    public class BossEnemy : EnemyBase
+    {
+        [Header("Boss Settings")]
+        [Tooltip("보스 페이즈 데이터 목록 (순서대로 전환)")]
+        [SerializeField] private List<BossPhaseData> phases = new();
+        
+        [Tooltip("초기 Behavior Graph")]
+        [SerializeField] private BehaviorGraph initialBehaviorGraph;
+
+        [Header("Phase Settings")]
+        [Tooltip("페이즈 전환 시 무적 시간")]
+        [Min(0f)] [SerializeField] private float phaseTransitionInvincibilityTime = 2f;
+        
+        [Tooltip("페이즈 전환 연출 시간")]
+        [Min(0f)] [SerializeField] private float phaseTransitionDuration = 3f;
+
+        [Header("Debug")]
+        [SerializeField] private bool debugMode = true;
+
+        // 컴포넌트
+        private BehaviorGraphAgent behaviorAgent;
+
+        // 페이즈 상태
+        private int currentPhaseIndex = 0;
+        private bool isTransitioning = false;
+        private float phaseStartTime;
+        private float phaseElapsedTime;
+        private bool isInvincible = false;
+
+        // 커스텀 조건 딕셔너리
+        private Dictionary<string, bool> customConditions = new Dictionary<string, bool>();
+
+        // 이벤트
+        public event System.Action<int> OnPhaseChanged; // phaseIndex
+        public event System.Action<float> OnPhaseTransitionStart; // transitionDuration
+        public event System.Action OnPhaseTransitionEnd;
+
+        // Properties
+        public int CurrentPhaseIndex => currentPhaseIndex;
+        public BossPhaseData CurrentPhase => phases.Count > currentPhaseIndex ? phases[currentPhaseIndex] : null;
+        public int TotalPhases => phases.Count;
+        public bool IsTransitioning => isTransitioning;
+        public float PhaseElapsedTime => phaseElapsedTime;
+
+        public override void OnNetworkSpawn()
+        {
+            base.OnNetworkSpawn();
+
+            // BehaviorGraphAgent 컴포넌트 확인/추가
+            behaviorAgent = GetComponent<BehaviorGraphAgent>();
+            if (behaviorAgent == null)
+            {
+                behaviorAgent = gameObject.AddComponent<BehaviorGraphAgent>();
+            }
+
+            // 초기 AI 설정
+            if (IsServer && initialBehaviorGraph != null)
+            {
+                behaviorAgent.Graph = initialBehaviorGraph;
+            }
+        }
+
+        protected override void InitializeStats()
+        {
+            base.InitializeStats();
+            phaseStartTime = Time.time;
+            phaseElapsedTime = 0f;
+            currentPhaseIndex = 0;
+            isTransitioning = false;
+            isInvincible = false;
+            customConditions.Clear();
+        }
+
+        private void Update()
+        {
+            if (!IsServer || IsDead || isTransitioning)
+                return;
+
+            phaseElapsedTime = Time.time - phaseStartTime;
+
+            // 다음 페이즈 전환 조건 확인
+            CheckPhaseTransition();
+        }
+
+        /// <summary>
+        /// 페이즈 전환 조건 확인
+        /// </summary>
+        private void CheckPhaseTransition()
+        {
+            int nextPhaseIndex = currentPhaseIndex + 1;
+            if (nextPhaseIndex >= phases.Count)
+                return;
+
+            BossPhaseData nextPhase = phases[nextPhaseIndex];
+            if (nextPhase == null)
+                return;
+
+            if (nextPhase.CheckTransitionCondition(this, phaseElapsedTime))
+            {
+                StartPhaseTransition(nextPhaseIndex);
+            }
+        }
+
+        /// <summary>
+        /// 페이즈 전환 시작
+        /// </summary>
+        private void StartPhaseTransition(int newPhaseIndex)
+        {
+            if (newPhaseIndex >= phases.Count || isTransitioning)
+                return;
+
+            isTransitioning = true;
+            isInvincible = true;
+
+            StartCoroutine(PhaseTransitionCoroutine(newPhaseIndex));
+        }
+
+        private System.Collections.IEnumerator PhaseTransitionCoroutine(int newPhaseIndex)
+        {
+            BossPhaseData newPhase = phases[newPhaseIndex];
+
+            // 전환 이벤트
+            OnPhaseTransitionStart?.Invoke(phaseTransitionDuration);
+
+            // 전환 연출
+            yield return PlayPhaseTransitionEffect(newPhase);
+
+            // AI 그래프 교체
+            if (newPhase.BehaviorGraph != null && behaviorAgent != null)
+            {
+                behaviorAgent.End();
+                behaviorAgent.Graph = newPhase.BehaviorGraph;
+            }
+
+            // 페이즈 전환 완료
+            currentPhaseIndex = newPhaseIndex;
+            phaseStartTime = Time.time;
+            phaseElapsedTime = 0f;
+
+            // 무적 해제
+            yield return new WaitForSeconds(phaseTransitionInvincibilityTime);
+            isInvincible = false;
+            isTransitioning = false;
+
+            OnPhaseTransitionEnd?.Invoke();
+            OnPhaseChanged?.Invoke(currentPhaseIndex);
+
+            if (debugMode)
+            {
+                Debug.Log($"[Boss] Phase transition: {currentPhaseIndex} ({newPhase.PhaseName})");
+            }
+        }
+
+        /// <summary>
+        /// 페이즈 전환 연출 재생
+        /// </summary>
+        private System.Collections.IEnumerator PlayPhaseTransitionEffect(BossPhaseData newPhase)
+        {
+            // 애니메이션 재생
+            if (animator != null && newPhase.PhaseStartAnimation != null)
+            {
+                animator.Play(newPhase.PhaseStartAnimation.name);
+            }
+
+            // 이펙트 생성
+            if (newPhase.PhaseTransitionEffect != null)
+            {
+                var effect = Instantiate(newPhase.PhaseTransitionEffect, transform.position, transform.rotation);
+                Destroy(effect, phaseTransitionDuration);
+            }
+
+            // 전환 시간 대기
+            yield return new WaitForSeconds(phaseTransitionDuration);
+        }
+
+        /// <summary>
+        /// 대미지 적용 (무적 상태 고려)
+        /// </summary>
+        public override float TakeDamage(float damage, object source = null)
+        {
+            if (isInvincible)
+                return 0f;
+
+            return base.TakeDamage(damage, source);
+        }
+
+        /// <summary>
+        /// 커스텀 조건 설정
+        /// </summary>
+        public void SetCustomCondition(string conditionId, bool value)
+        {
+            customConditions[conditionId] = value;
+        }
+
+        /// <summary>
+        /// 커스텀 조건 확인
+        /// </summary>
+        public bool CheckCustomCondition(string conditionId)
+        {
+            return customConditions.TryGetValue(conditionId, out bool value) && value;
+        }
+
+        /// <summary>
+        /// 수동으로 페이즈 전환
+        /// </summary>
+        public void ForcePhaseTransition(int phaseIndex)
+        {
+            if (!IsServer)
+                return;
+
+            if (phaseIndex >= 0 && phaseIndex < phases.Count && phaseIndex != currentPhaseIndex)
+            {
+                StartPhaseTransition(phaseIndex);
+            }
+        }
+
+        /// <summary>
+        /// 현재 페이즈 재시작
+        /// </summary>
+        public void RestartCurrentPhase()
+        {
+            if (!IsServer)
+                return;
+
+            phaseStartTime = Time.time;
+            phaseElapsedTime = 0f;
+
+            if (behaviorAgent != null)
+            {
+                behaviorAgent.Restart();
+            }
+        }
+
+        protected override void HandleDeath()
+        {
+            // 마지막 페이즈에서만 사망 처리
+            if (currentPhaseIndex < phases.Count - 1 && !isTransitioning)
+            {
+                // 아직 페이즈가 남아있으면 강제로 다음 페이즈로
+                StartPhaseTransition(currentPhaseIndex + 1);
+                return;
+            }
+
+            base.HandleDeath();
+
+            // AI 정지
+            if (behaviorAgent != null)
+            {
+                behaviorAgent.End();
+            }
+        }
+
+        #region Debug
+
+        private void OnDrawGizmosSelected()
+        {
+            if (!debugMode)
+                return;
+
+            // 현재 페이즈 정보 표시
+            #if UNITY_EDITOR
+            if (phases != null && currentPhaseIndex < phases.Count)
+            {
+                var phase = phases[currentPhaseIndex];
+                if (phase != null)
+                {
+                    UnityEditor.Handles.Label(
+                        transform.position + Vector3.up * 3f,
+                        $"Phase {currentPhaseIndex + 1}/{phases.Count}\n{phase.PhaseName}"
+                    );
+                }
+            }
+            #endif
+        }
+
+        #endregion
+    }
+}
diff --git a/Assets/Scripts/Enemy/BossEnemy.cs.meta b/Assets/Scripts/Enemy/BossEnemy.cs.meta
new file mode 100644
index 00000000..bfae6985
--- /dev/null
+++ b/Assets/Scripts/Enemy/BossEnemy.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 4a49d1cf004a0c944be905fe6fabf936
\ No newline at end of file