diff --git a/server/gameserver/creature.h b/server/gameserver/creature.h
index 0ff67ab..c6b1231 100644
--- a/server/gameserver/creature.h
+++ b/server/gameserver/creature.h
@@ -3,7 +3,6 @@
 #include "weakptr.h"
 #include "moveableentity.h"
 #include "buff.h"
-#include "weakptr.h"
 #include "trigger.h"
 #include "ability.h"
 
diff --git a/server/gameserver/hero.ai.cc b/server/gameserver/hero.ai.cc
index df7a1d5..1d742a3 100644
--- a/server/gameserver/hero.ai.cc
+++ b/server/gameserver/hero.ai.cc
@@ -8,36 +8,6 @@
 #include "metamgr.h"
 #include "player.h"
 
-enum HeroState_e : int
-{
-   HSE_Idle = 0,
-   HSE_Thinking = 1,
-   HSE_Attack = 2,
-   HSE_RandomWalk = 3,
-   HSE_Pursuit = 4,
-   HSE_FollowMaster = 5
-};
-
-class HeroAINode
-{
-public:
-    HeroState_e main_state = HSE_Idle;
-    long long frameno = 0;
-    long long exec_frame_num = 0;
-    long long start_shot_frameno = 0;
-    long long next_random_move_frameno = 0;
-    int shot_times = 0;
-    int total_shot_times = 0;
-    int next_total_shot_times = 0;
-
-    long long param1 = 0;
-    CreatureWeakPtr target;
-    CreatureWeakPtr nearest_human;
-    long long last_check_nearest_human_frameno = 0;
-    a8::Vec2 shot_dir;
-    a8::Vec2 target_pos;
-};
-
 HeroAI::HeroAI()
 {
     node_ = new HeroAINode();
diff --git a/server/gameserver/hero.ai.h b/server/gameserver/hero.ai.h
index 9cc5c73..9ea7954 100644
--- a/server/gameserver/hero.ai.h
+++ b/server/gameserver/hero.ai.h
@@ -1,10 +1,40 @@
 #pragma once
 
+#include <a8/vec2.h>
+
 #include "aicomponent.h"
 #include "weakptr.h"
 
-enum HeroState_e : int;
-class HeroAINode;
+enum HeroState_e : int
+{
+   HSE_Idle = 0,
+   HSE_Thinking = 1,
+   HSE_Attack = 2,
+   HSE_RandomWalk = 3,
+   HSE_Pursuit = 4,
+   HSE_FollowMaster = 5
+};
+
+class HeroAINode
+{
+public:
+    HeroState_e main_state = HSE_Idle;
+    long long frameno = 0;
+    long long exec_frame_num = 0;
+    long long start_shot_frameno = 0;
+    long long next_random_move_frameno = 0;
+    int shot_times = 0;
+    int total_shot_times = 0;
+    int next_total_shot_times = 0;
+
+    long long param1 = 0;
+    CreatureWeakPtr target;
+    CreatureWeakPtr nearest_human;
+    long long last_check_nearest_human_frameno = 0;
+    a8::Vec2 shot_dir;
+    a8::Vec2 target_pos;
+};
+
 class HeroAI : public AIComponent
 {
 public:
diff --git a/server/gameserver/roomobstacle.cc b/server/gameserver/roomobstacle.cc
index 633649f..91b580a 100644
--- a/server/gameserver/roomobstacle.cc
+++ b/server/gameserver/roomobstacle.cc
@@ -14,6 +14,7 @@
 
 RoomObstacle::RoomObstacle():Obstacle()
 {
+    weak_ptr_chunk_.Set(this);
 }
 
 RoomObstacle::~RoomObstacle()
@@ -549,3 +550,18 @@ void RoomObstacle::ProcKeepRangeBuff()
         room->xtimer.DeleteTimer(room->xtimer.GetRunningTimer());
     }
 }
+
+RoomObstacleWeakPtr RoomObstacle::AllocWeakPtr()
+{
+    RoomObstacleWeakPtr ptr;
+    ptr.Attach(this);
+    return ptr;
+}
+
+RoomObstacleWeakPtr& RoomObstacle::GetWeakPtrRef()
+{
+    if (!weak_ptr_.Get()) {
+        weak_ptr_.Attach(this);
+    }
+    return weak_ptr_;
+}
diff --git a/server/gameserver/roomobstacle.h b/server/gameserver/roomobstacle.h
index b10596c..d2adc2c 100644
--- a/server/gameserver/roomobstacle.h
+++ b/server/gameserver/roomobstacle.h
@@ -1,5 +1,6 @@
 #pragma once
 
+#include "weakptr.h"
 #include "gridservice.h"
 #include "obstacle.h"
 #include "weakptr.h"
@@ -28,6 +29,10 @@ class RoomObstacle : public Obstacle
     virtual void Die(Room* room) override;
     Entity* GetRealObject(Room* room);
 
+    RoomObstacleWeakPtrChunk* GetWeakPtrChunk() { return &weak_ptr_chunk_; };
+    RoomObstacleWeakPtr AllocWeakPtr();
+    RoomObstacleWeakPtr& GetWeakPtrRef();
+
 private:
     void SpecExplosion();
     void ActiveSelfExplosion();
@@ -44,6 +49,9 @@ private:
     void ProcKeepRangeBuff();
 
 protected:
+    RoomObstacleWeakPtr weak_ptr_;
+    RoomObstacleWeakPtrChunk weak_ptr_chunk_;
+
     std::set<GridCell*>* grid_list_ = nullptr;
     int explosion_times_ = 0;
     bool detached_ = false;
diff --git a/server/gameserver/weakptr.cc b/server/gameserver/weakptr.cc
index f1912f2..f13d65b 100644
--- a/server/gameserver/weakptr.cc
+++ b/server/gameserver/weakptr.cc
@@ -1,6 +1,7 @@
 #include "precompile.h"
 #include "weakptr.h"
 #include "creature.h"
+#include "roomobstacle.h"
 
 CreatureWeakPtrChunk::CreatureWeakPtrChunk()
 {
@@ -109,3 +110,111 @@ void CreatureWeakPtr::Detach()
         list_del_init(&entry_);
     }
 }
+
+RoomObstacleWeakPtrChunk::RoomObstacleWeakPtrChunk()
+{
+    INIT_LIST_HEAD(&ptrs_);
+}
+
+RoomObstacleWeakPtrChunk::~RoomObstacleWeakPtrChunk()
+{
+    Clear();
+}
+
+void RoomObstacleWeakPtrChunk::Clear()
+{
+    struct RoomObstacleWeakPtr *weakptr, *tmp;
+    struct list_head ptr_list;
+
+    list_replace_init(&ptrs_, &ptr_list);
+    list_for_each_entry_safe(weakptr, tmp, &ptr_list, entry_) {
+        weakptr->Reset();
+    }
+}
+
+void RoomObstacleWeakPtrChunk::Set(RoomObstacle* c)
+{
+    ptr_ = c;
+}
+
+RoomObstacleWeakPtr::RoomObstacleWeakPtr()
+{
+    INIT_LIST_HEAD(&entry_);
+}
+
+RoomObstacleWeakPtr::RoomObstacleWeakPtr(const RoomObstacleWeakPtr& x)
+{
+    INIT_LIST_HEAD(&entry_);
+    if (x.ptr_) {
+        Attach(x.ptr_);
+    }
+}
+
+RoomObstacleWeakPtr::RoomObstacleWeakPtr(RoomObstacleWeakPtr&& x)
+{
+    INIT_LIST_HEAD(&entry_);
+    if (x.ptr_) {
+        Attach(x.ptr_);
+        x.Detach();
+    }
+}
+
+RoomObstacleWeakPtr& RoomObstacleWeakPtr::operator=(const RoomObstacleWeakPtr& x)
+{
+    if (ptr_) {
+        Detach();
+    }
+    if (x.ptr_) {
+        Attach(x.ptr_);
+    }
+    return *this;
+}
+
+RoomObstacleWeakPtr&& RoomObstacleWeakPtr::operator=(RoomObstacleWeakPtr&& x)
+{
+    if (ptr_) {
+        Detach();
+    }
+    if (x.ptr_) {
+        Attach(x.ptr_);
+        x.Detach();
+    }
+    abort();
+    //    return *this;
+}
+
+RoomObstacleWeakPtr::~RoomObstacleWeakPtr()
+{
+    Reset();
+}
+
+void RoomObstacleWeakPtr::Reset()
+{
+    if (ptr_) {
+        Detach();
+    }
+}
+
+RoomObstacle* RoomObstacleWeakPtr::Get()
+{
+    return ptr_;
+}
+
+void RoomObstacleWeakPtr::Attach(RoomObstacle* c)
+{
+    Reset();
+    RoomObstacleWeakPtrChunk* chunk = c->GetWeakPtrChunk();
+    if (c != chunk->ptr_) {
+        abort();
+    }
+    ptr_ = c;
+    list_add_tail(&entry_, &chunk->ptrs_);
+}
+
+void RoomObstacleWeakPtr::Detach()
+{
+    if (ptr_) {
+        ptr_ = nullptr;
+        list_del_init(&entry_);
+    }
+}
diff --git a/server/gameserver/weakptr.h b/server/gameserver/weakptr.h
index 25d78e8..3fb14ad 100644
--- a/server/gameserver/weakptr.h
+++ b/server/gameserver/weakptr.h
@@ -41,3 +41,42 @@ class CreatureWeakPtr
 
     friend class CreatureWeakPtrChunk;
 };
+
+class RoomObstacle;
+
+class RoomObstacleWeakPtrChunk
+{
+ public:
+
+    RoomObstacleWeakPtrChunk();
+    ~RoomObstacleWeakPtrChunk();
+    void Clear();
+    void Set(RoomObstacle* c);
+
+ private:
+    RoomObstacle* ptr_ = nullptr;
+    list_head ptrs_;
+    friend class RoomObstacleWeakPtr;
+};
+
+class RoomObstacleWeakPtr
+{
+ public:
+
+    RoomObstacleWeakPtr();
+    RoomObstacleWeakPtr(const RoomObstacleWeakPtr& x);
+    RoomObstacleWeakPtr(RoomObstacleWeakPtr&& x);
+    RoomObstacleWeakPtr& operator=(const RoomObstacleWeakPtr& x);
+    RoomObstacleWeakPtr&& operator=(RoomObstacleWeakPtr&& x);
+    ~RoomObstacleWeakPtr();
+    void Reset();
+    RoomObstacle* Get();
+    void Attach(RoomObstacle* c);
+    void Detach();
+
+ private:
+    RoomObstacle* ptr_ = nullptr;
+    list_head entry_;
+
+    friend class RoomObstacleWeakPtrChunk;
+};