diff --git a/server/gameserver/creature.cc b/server/gameserver/creature.cc
index 422c545e..a82f4656 100644
--- a/server/gameserver/creature.cc
+++ b/server/gameserver/creature.cc
@@ -2452,6 +2452,9 @@ void Creature::SummonObstacle(Buff* buff, int id, const a8::Vec2& target_pos)
         }
         obstacle->context_ability = context_ability;
         slave_things_.push_back(std::make_tuple(buff->meta->i->buff_id(), obstacle));
+        if (buff->skill_meta) {
+            SkillHelper::ProcSummonObstacle(buff->skill_meta, obstacle);
+        }
 #ifdef DEBUG
         SendDebugMsg(a8::Format("召唤物件 buff_id:%d thing_id:%d pos:%f,%f target_pos:%f,%f",
                                 {buff->meta->i->buff_id(),
diff --git a/server/gameserver/metadata.cc b/server/gameserver/metadata.cc
index d491c086..30cd7592 100644
--- a/server/gameserver/metadata.cc
+++ b/server/gameserver/metadata.cc
@@ -1053,12 +1053,12 @@ namespace MetaData
         }
     }
 
-    int Skill::GetMagicId()
+    int Skill::GetMagicId() const
     {
         return magic_id;
     }
 
-    bool Skill::IsTurnOverSkill()
+    bool Skill::IsTurnOverSkill() const
     {
         return !phases.empty() && phases[0].func_id == kSkill_TurnOver;
     }
diff --git a/server/gameserver/metadata.h b/server/gameserver/metadata.h
index e7709b9f..95efe434 100644
--- a/server/gameserver/metadata.h
+++ b/server/gameserver/metadata.h
@@ -318,8 +318,8 @@ namespace MetaData
         std::set<int> buff_list;
         std::map<int, std::set<MetaData::Buff*>> trigger_type_buffs;
         std::vector<MetaData::SkillPhase> phases;
-        bool IsTurnOverSkill();
-        int GetMagicId();
+        bool IsTurnOverSkill() const;
+        int GetMagicId() const;
     private:
         int magic_id = 0;
         int base_skill_id = 0;
diff --git a/server/gameserver/roomobstacle.cc b/server/gameserver/roomobstacle.cc
index 4da7ef9c..7d61bbf9 100644
--- a/server/gameserver/roomobstacle.cc
+++ b/server/gameserver/roomobstacle.cc
@@ -362,7 +362,7 @@ void RoomObstacle::Active()
         break;
     }
     if (meta->i->life_time() > 0) {
-        room->xtimer.AddDeadLineTimerAndAttach
+        xtimer_list* timer = room->xtimer.AddDeadLineTimerAndAttach
             (
              meta->i->life_time() / FRAME_RATE_MS,
              a8::XParams()
@@ -374,6 +374,7 @@ void RoomObstacle::Active()
              },
              &xtimer_attacher.timer_list_
              );
+        life_time_timer = room->xtimer.GetTimerPtr(timer);
     }
 }
 
diff --git a/server/gameserver/roomobstacle.h b/server/gameserver/roomobstacle.h
index 9a655b03..942a6ab6 100644
--- a/server/gameserver/roomobstacle.h
+++ b/server/gameserver/roomobstacle.h
@@ -25,6 +25,7 @@ class RoomObstacle : public Obstacle
     MetaData::Buff* buff_meta = nullptr;
     MetaData::Skill* skill_meta = nullptr;
     long long born_frameno = 0;
+    std::weak_ptr<a8::XTimerPtr> life_time_timer;
 
     virtual ~RoomObstacle() override;
     virtual void Initialize() override;
diff --git a/server/gameserver/skillhelper.cc b/server/gameserver/skillhelper.cc
index b1913e0c..496db7d7 100644
--- a/server/gameserver/skillhelper.cc
+++ b/server/gameserver/skillhelper.cc
@@ -7,6 +7,7 @@
 #include "skill.h"
 #include "metadata.h"
 #include "room.h"
+#include "roomobstacle.h"
 
 std::map<int, int> SkillHelper::magic_skill_hash_;
 std::map<int, int> SkillHelper::skill_magic_hash_;
@@ -282,3 +283,26 @@ bool SkillHelper::ProcBulletDmg(Bullet* bullet, Creature* target, float& finaly_
     }
     return false;
 }
+
+void SkillHelper::ProcSummonObstacle(const MetaData::Skill* skill_meta, RoomObstacle* ob)
+{
+    if (!skill_meta || skill_meta->number_meta) {
+        return;
+    }
+   switch (skill_meta->GetMagicId()) {
+   case MAGIC_WLFB:
+   case MAGIC_YLZ:
+        {
+            if (!ob->life_time_timer.expired()) {
+                ob->room->xtimer.ModifyTimer(ob->life_time_timer,
+                                            skill_meta->number_meta->float_time * 1000 / FRAME_RATE_MS);
+            }
+        }
+        break;
+    default:
+        {
+        }
+        break;
+    }
+
+}
diff --git a/server/gameserver/skillhelper.h b/server/gameserver/skillhelper.h
index a8178812..4ce42cbe 100644
--- a/server/gameserver/skillhelper.h
+++ b/server/gameserver/skillhelper.h
@@ -7,6 +7,7 @@ namespace MetaData
 
 class Bullet;
 class Creature;
+class RoomObstacle;
 class SkillHelper
 {
  public:
@@ -36,6 +37,7 @@ class SkillHelper
 
     static void ProcBulletHitBuff(Bullet* bullet, Creature* c, int buff_uniid);
     static bool ProcBulletDmg(Bullet* bullet, Creature* target, float& finaly_dmg);
+    static void ProcSummonObstacle(const MetaData::Skill* skill_meta, RoomObstacle* ob);
 
 private:
 
diff --git a/third_party/a8engine b/third_party/a8engine
index cf4607dd..9d9efccd 160000
--- a/third_party/a8engine
+++ b/third_party/a8engine
@@ -1 +1 @@
-Subproject commit cf4607dd902bcca2ec8e849b51a1968ffb2dc0ca
+Subproject commit 9d9efccd69f5a81ac2905617d2fe4d197394f27c