diff --git a/src/common/Common.h b/src/common/Common.h
index 277e5bd1..0149a389 100644
--- a/src/common/Common.h
+++ b/src/common/Common.h
@@ -1051,6 +1051,7 @@ namespace Sapphire::Common
     BlockParryRateBonus = 14,
     MPRestorePerGCD = 15,
     AlwaysCombo = 16,
+    PotencyMultiplier = 17,
   };
 
   enum class ActionTypeFilter : int32_t
diff --git a/src/world/Action/Action.cpp b/src/world/Action/Action.cpp
index 646759bf..c2e4288e 100644
--- a/src/world/Action/Action.cpp
+++ b/src/world/Action/Action.cpp
@@ -668,6 +668,11 @@ void Action::Action::buildEffects()
                   player->gaugeGnbSetAmmo( std::min( 2, player->gaugeGnbGetAmmo() + m_lutEntry.bonusDataByte4 ) );
                   break;
                 }
+                case Common::ClassJob::Samurai:
+                {
+                  player->gaugeSamSetKenki( std::min( 100, player->gaugeSamGetKenki() + m_lutEntry.bonusDataByte4 ) );
+                  break;
+                }
               }
             }
           }
@@ -1160,12 +1165,12 @@ Action::EffectBuilderPtr Action::Action::getEffectbuilder()
   return m_effectBuilder;
 }
 
-Data::ActionPtr Action::Action::getActionData() const
+Data::ActionPtr Action::Action::getActionData()
 {
   return m_actionData;
 }
 
-Action::ActionEntry Action::Action::getActionEntry() const
+Action::ActionEntry& Action::Action::getActionEntry()
 {
   return m_lutEntry;
 }
diff --git a/src/world/Action/Action.h b/src/world/Action/Action.h
index 3c215684..8c91dc57 100644
--- a/src/world/Action/Action.h
+++ b/src/world/Action/Action.h
@@ -126,8 +126,8 @@ namespace Sapphire::World::Action
      */
     Entity::CharaPtr getHitChara();
 
-    Data::ActionPtr getActionData() const;
-    ActionEntry getActionEntry() const;
+    Data::ActionPtr getActionData();
+    ActionEntry& getActionEntry();
     float getAnimationLock();
 
     void setPrimaryCost( Common::ActionPrimaryCostType type, uint16_t cost );
diff --git a/src/world/Action/ActionLutData.cpp b/src/world/Action/ActionLutData.cpp
index 4d4eeb93..bf4c3a4b 100644
--- a/src/world/Action/ActionLutData.cpp
+++ b/src/world/Action/ActionLutData.cpp
@@ -3023,8 +3023,8 @@ ActionLut::StatusEffectTable ActionLut::m_statusEffectTable =
   //Jinpu, 陣風: DamageMultiplier, All, 13%
   //{ 1298, { 1, 255, 13, 0, 0 } },
 
-  //Kaiten, 必殺剣・回天: DamageMultiplier, All, 50%
-  { 1229, { 1, 255, 50, 0, 0 } },
+  //Kaiten, 必殺剣・回天: PotencyMultiplier, 1 uses, 50%
+  { 1229, { 17, 1, 0, 3, 50 } },
 
   //Higanbana, 彼岸花: Dot, Physical, potency 60
   { 1228, { 4, 1, 60, 0, 0 } },
diff --git a/src/world/StatusEffect/StatusEffect.cpp b/src/world/StatusEffect/StatusEffect.cpp
index 8432331c..91bf3208 100644
--- a/src/world/StatusEffect/StatusEffect.cpp
+++ b/src/world/StatusEffect/StatusEffect.cpp
@@ -380,8 +380,32 @@ void Sapphire::StatusEffect::StatusEffect::onBeforeActionStart( Sapphire::World:
           }
           action->setAlwaysCombo();
         }
-        break;
       }
+      break;
+    }
+    case Common::StatusEffectType::PotencyMultiplier:
+    {
+      if( checkAction1( action, m_effectEntry ) )
+      {
+        if( m_effectEntry.effectValue1 > 0 )
+        {
+          if( m_effectEntry.effectValue1 == getStacks() )
+          {
+            // if stacks equal to remaining uses, assume it is synced
+            setStacks( getStacks() - 1 );
+            m_targetActor->sendStatusEffectUpdate();
+          }
+          m_effectEntry.effectValue1--;
+          if( m_effectEntry.effectValue1 == 0 )
+          {
+            markToRemove();
+          }
+          action->getActionEntry().damagePotency *= 1.0 + ( m_effectEntry.effectValue4 / 100.0 );
+          action->getActionEntry().damageComboPotency *= 1.0 + ( m_effectEntry.effectValue4 / 100.0 );
+          action->getActionEntry().damageDirectionalPotency *= 1.0 + ( m_effectEntry.effectValue4 / 100.0 );
+        }
+      }
+      break;
     }
   }
 }