diff --git a/src/common/Common.h b/src/common/Common.h
index e258b3aa..0135c030 100644
--- a/src/common/Common.h
+++ b/src/common/Common.h
@@ -1039,6 +1039,7 @@ namespace Sapphire::Common
     Shield = 10,
     MPRestore = 11,
     Haste = 12,
+    InstantCast = 13,
   };
 
   enum class ActionTypeFilter : int32_t
diff --git a/src/world/Action/ActionLutData.cpp b/src/world/Action/ActionLutData.cpp
index 4b44b5e3..96313c15 100644
--- a/src/world/Action/ActionLutData.cpp
+++ b/src/world/Action/ActionLutData.cpp
@@ -3511,4 +3511,7 @@ ActionLut::StatusEffectTable ActionLut::m_statusEffectTable =
   //Presence of Mind, 神速魔: Haste, 20%
   { 157, { 12, 20, 0, 0, 0 } },
 
+  //Swiftcast, 迅速魔: InstantCast, 1 casts
+  { 167, { 13, 1, 0, 0, 0 } },
+
 };
diff --git a/src/world/Actor/Chara.cpp b/src/world/Actor/Chara.cpp
index da3bff35..6bd8c039 100644
--- a/src/world/Actor/Chara.cpp
+++ b/src/world/Actor/Chara.cpp
@@ -722,7 +722,7 @@ void Sapphire::Entity::Chara::updateStatusEffects()
     uint32_t duration = effect->getDuration();
     uint32_t tickRate = effect->getTickRate();
 
-    if( duration > 0 && ( currentTimeMs - startTime ) > duration )
+    if( effect->isMarkedToRemove() || ( duration > 0 && ( currentTimeMs - startTime ) > duration ) )
     {
       // remove status effect
       removeStatusEffect( effectIndex, true, true );
diff --git a/src/world/Manager/ActionMgr.cpp b/src/world/Manager/ActionMgr.cpp
index 2356d7b3..f5a7303e 100644
--- a/src/world/Manager/ActionMgr.cpp
+++ b/src/world/Manager/ActionMgr.cpp
@@ -5,6 +5,8 @@
 #include "Script/ScriptMgr.h"
 #include "Actor/Player.h"
 
+#include "StatusEffect/StatusEffect.h"
+
 #include <Exd/ExdDataGenerated.h>
 #include "Framework.h"
 
@@ -89,6 +91,11 @@ void World::Manager::ActionMgr::bootstrapAction( Entity::Player& player,
     return;
   }
 
+  for( const auto& statusIt : player.getStatusEffectMap() )
+  {
+    statusIt.second->onBeforeActionStart( currentAction );
+  }
+
   if( player.getCurrentAction() )
   {
     player.sendDebug( "Skill queued: {0}", currentAction->getId() );
diff --git a/src/world/StatusEffect/StatusEffect.cpp b/src/world/StatusEffect/StatusEffect.cpp
index 30ae2125..3392c331 100644
--- a/src/world/StatusEffect/StatusEffect.cpp
+++ b/src/world/StatusEffect/StatusEffect.cpp
@@ -9,6 +9,8 @@
 #include "Actor/Chara.h"
 #include "Actor/Actor.h"
 
+#include "Action/Action.h"
+
 #include "Script/ScriptMgr.h"
 
 #include "Math/CalcStats.h"
@@ -32,7 +34,8 @@ Sapphire::StatusEffect::StatusEffect::StatusEffect( uint32_t id, Entity::CharaPt
   m_pFw( pFw ),
   m_value( 0 ),
   m_cachedSourceCrit( 0 ),
-  m_cachedSourceCritBonus( 0 )
+  m_cachedSourceCritBonus( 0 ),
+  m_markToRemove( false )
 {
   auto pExdData = m_pFw->get< Data::ExdDataGenerated >();
   auto entry = pExdData->get< Sapphire::Data::Status >( id );
@@ -262,4 +265,44 @@ const Sapphire::World::Action::StatusEffectEntry& Sapphire::StatusEffect::Status
 void Sapphire::StatusEffect::StatusEffect::replaceEffectEntry( Sapphire::World::Action::StatusEffectEntry entryOverride )
 {
   m_effectEntry = entryOverride;
+}
+
+void Sapphire::StatusEffect::StatusEffect::onBeforeActionStart( Sapphire::World::Action::ActionPtr action )
+{
+  // todo: add script function for this if needed
+  //auto pScriptMgr = m_pFw->get< Scripting::ScriptMgr >();
+  //pScriptMgr->onBeforeActionStart( m_targetActor, *this );
+
+  switch( static_cast< Common::StatusEffectType >( m_effectEntry.effectType ) )
+  {
+    case Common::StatusEffectType::InstantCast:
+    {
+      if( !action->hasCastTime() )
+        return;
+      // value1: remaining uses
+      // value2-4: affected action ids, or all actions if value2 is 0
+      if( m_effectEntry.effectValue2 != 0 )
+      {
+        if( action->getId() != m_effectEntry.effectValue2 &&
+            action->getId() != m_effectEntry.effectValue3 &&
+            action->getId() != m_effectEntry.effectValue4 )
+          return;
+      }
+      if( m_effectEntry.effectValue1 > 0 )
+      {
+        m_effectEntry.effectValue1--;
+        if( m_effectEntry.effectValue1 == 0 )
+        {
+          m_markToRemove = true;
+        }
+        action->setCastTime( 0 );
+      }
+      break;
+    }
+  }
+}
+
+bool Sapphire::StatusEffect::StatusEffect::isMarkedToRemove()
+{
+  return m_markToRemove;
 }
\ No newline at end of file
diff --git a/src/world/StatusEffect/StatusEffect.h b/src/world/StatusEffect/StatusEffect.h
index 70a9cd0d..a297094e 100644
--- a/src/world/StatusEffect/StatusEffect.h
+++ b/src/world/StatusEffect/StatusEffect.h
@@ -19,6 +19,8 @@ public:
 
   void onTick();
 
+  void onBeforeActionStart( World::Action::ActionPtr action );
+
   void applyStatus();
 
   void removeStatus();
@@ -53,6 +55,8 @@ public:
 
   void replaceEffectEntry( Sapphire::World::Action::StatusEffectEntry entryOverride );
 
+  bool isMarkedToRemove();
+
 private:
   uint32_t m_id;
   Entity::CharaPtr m_sourceActor;
@@ -69,6 +73,7 @@ private:
   uint32_t m_value;
   float m_cachedSourceCrit;
   float m_cachedSourceCritBonus;
+  bool m_markToRemove;
 };
 
 }