[Trigger] Hitting self

[Nephets]

Im making an ability that does a whirlwind, damage is based on the Strength of the hero x the level of the ability. However i keep damaging myself when the WW goes off. How can i stop hitting myself

• Whirlwind
  • Events
    • Unit - A unit Starts the effect of an ability
  • Conditions
    • (Ability being cast) Equal to Whirlwind
  • Actions
    • Set Whirlwind_Caster = (Casting unit)
    • Set Whirlwind_Strength = (Strength of Whirlwind_Caster (Include bonuses))
    • Set Whirlwind_Level = (Level of Whirlwind for Whirlwind_Caster)
    • Unit - Cause Whirlwind_Caster to damage circular area after 0.00 seconds of radius 200.00 at (Position of Whirlwind_Caster), dealing ((Real(Whirlwind_Strength)) x (Real(Whirlwind_Level))) damage of attack type Spells and damage type Normal