diff --git a/src/strategy/actions/GenericSpellActions.cpp b/src/strategy/actions/GenericSpellActions.cpp
index 8b53ec7b..ec12a965 100644
--- a/src/strategy/actions/GenericSpellActions.cpp
+++ b/src/strategy/actions/GenericSpellActions.cpp
@@ -292,3 +292,7 @@ Value<Unit*>* BuffOnMainTankAction::GetTargetValue()
     return context->GetValue<Unit*>("main tank", spell);
 }
 
+bool CastDebuffSpellAction::isUseful()
+{
+    return CastAuraSpellAction::isUseful() && GetTarget() && (GetTarget()->GetHealth() / AI_VALUE(float, "expected group dps")) >= needLifeTime;
+}
\ No newline at end of file
diff --git a/src/strategy/actions/GenericSpellActions.h b/src/strategy/actions/GenericSpellActions.h
index 21743d2c..bbe1b480 100644
--- a/src/strategy/actions/GenericSpellActions.h
+++ b/src/strategy/actions/GenericSpellActions.h
@@ -50,13 +50,16 @@ class CastMeleeSpellAction : public CastSpellAction
 class CastDebuffSpellAction : public CastAuraSpellAction
 {
     public:
-        CastDebuffSpellAction(PlayerbotAI* botAI, std::string const spell, bool isOwner = false) : CastAuraSpellAction(botAI, spell, isOwner) { }
+        CastDebuffSpellAction(PlayerbotAI* botAI, std::string const spell, bool isOwner = false, float needLifeTime = 8.0f) : CastAuraSpellAction(botAI, spell, isOwner), needLifeTime(needLifeTime) { }
+        bool isUseful() override;
+    private:
+        float needLifeTime;
 };
 
-class CastDebuffSpellOnAttackerAction : public CastAuraSpellAction
+class CastDebuffSpellOnAttackerAction : public CastDebuffSpellAction
 {
     public:
-        CastDebuffSpellOnAttackerAction(PlayerbotAI* botAI, std::string const spell, bool isOwner = true) : CastAuraSpellAction(botAI, spell, isOwner) { }
+        CastDebuffSpellOnAttackerAction(PlayerbotAI* botAI, std::string const spell, bool isOwner = true, float needLifeTime = 8.0f) : CastDebuffSpellAction(botAI, spell, isOwner, needLifeTime) { }
 
         Value<Unit*>* GetTargetValue() override;
         std::string const getName() override { return spell + " on attacker"; }
diff --git a/src/strategy/hunter/HunterTriggers.cpp b/src/strategy/hunter/HunterTriggers.cpp
index 94b7589d..db6c7795 100644
--- a/src/strategy/hunter/HunterTriggers.cpp
+++ b/src/strategy/hunter/HunterTriggers.cpp
@@ -3,6 +3,7 @@
  */
 
 #include "HunterTriggers.h"
+#include "GenericTriggers.h"
 #include "HunterActions.h"
 #include "Playerbots.h"
 #include "ServerFacade.h"
@@ -18,7 +19,7 @@ bool HunterAspectOfTheHawkTrigger::IsActive()
 bool HunterNoStingsActiveTrigger::IsActive()
 {
 	Unit* target = AI_VALUE(Unit*, "current target");
-    return target && AI_VALUE2(uint8, "health", "current target") > 15 && 
+    return DebuffTrigger::IsActive() && target && 
         !botAI->HasAura("serpent sting", target, false, true) &&
         !botAI->HasAura("scorpid sting", target, false, true) && 
         !botAI->HasAura("viper sting", target, false, true);
diff --git a/src/strategy/hunter/HunterTriggers.h b/src/strategy/hunter/HunterTriggers.h
index 2d43b311..d1eace38 100644
--- a/src/strategy/hunter/HunterTriggers.h
+++ b/src/strategy/hunter/HunterTriggers.h
@@ -11,10 +11,10 @@
 
 class PlayerbotAI;
 
-class HunterNoStingsActiveTrigger : public Trigger
+class HunterNoStingsActiveTrigger : public DebuffTrigger
 {
     public:
-        HunterNoStingsActiveTrigger(PlayerbotAI* botAI): Trigger(botAI, "no stings") {}
+        HunterNoStingsActiveTrigger(PlayerbotAI* botAI): DebuffTrigger(botAI, "no stings") {}
         bool IsActive() override;
 };
 
diff --git a/src/strategy/triggers/GenericTriggers.h b/src/strategy/triggers/GenericTriggers.h
index 7b6bc339..c529f4f0 100644
--- a/src/strategy/triggers/GenericTriggers.h
+++ b/src/strategy/triggers/GenericTriggers.h
@@ -333,7 +333,7 @@ class DebuffOnBossTrigger : public DebuffTrigger
 class DebuffOnAttackerTrigger : public DebuffTrigger
 {
     public:
-        DebuffOnAttackerTrigger(PlayerbotAI* botAI, std::string const spell, bool checkIsOwner = true, float needLifeTime = 8000.0f) : DebuffTrigger(botAI, spell, 1, checkIsOwner, needLifeTime) { }
+        DebuffOnAttackerTrigger(PlayerbotAI* botAI, std::string const spell, bool checkIsOwner = true, float needLifeTime = 8.0f) : DebuffTrigger(botAI, spell, 1, checkIsOwner, needLifeTime) { }
 
         Value<Unit*>* GetTargetValue() override;
         std::string const getName() override { return spell + " on attacker"; }
diff --git a/src/strategy/warlock/WarlockActions.h b/src/strategy/warlock/WarlockActions.h
index 58f329fa..3b5f177e 100644
--- a/src/strategy/warlock/WarlockActions.h
+++ b/src/strategy/warlock/WarlockActions.h
@@ -141,7 +141,7 @@ class CastBanishAction : public CastBuffSpellAction
 class CastSeedOfCorruptionAction : public CastDebuffSpellAction
 {
     public:
-        CastSeedOfCorruptionAction(PlayerbotAI* botAI) : CastDebuffSpellAction(botAI, "seed of corruption", true) { }
+        CastSeedOfCorruptionAction(PlayerbotAI* botAI) : CastDebuffSpellAction(botAI, "seed of corruption", true, 0) { }
 };
 
 class CastRainOfFireAction : public CastSpellAction