Header

    globals  
       //@export
       BuffType Poisoned_heart // this is used to declare the buff
    endglobals 
    function dealDamage takes Buff b returns nothing // we need this function to deal damage to the buffed creep
        local Unit creep = b.getBuffedUnit() // this method is used to get the buffed creep
        local Tower tower = b.getCaster()  // this method is used to get the caster of the buff
        call tower.doSpellDamage(creep,b.userReal,tower.calcSpellCritNoBonus()) // replace yy with your own value
    endfunction 

//Do not remove or rename this function! 
//Put your initialization tasks here, this function will be called on map init  

    private function init takes nothing returns nothing  
        set Poisoned_heart=BuffType.create(9,0.5,false)  //replace zz with your own value
        call Poisoned_heart.setBuffIcon('@@0@@') // this is the id of the buff you have to create in the object editor
    
        call Poisoned_heart.addPeriodicEvent(EventHandler.dealDamage,1) // with this we add a periodic event to the buff
    endfunction

On Damage

function onDamage takes Tower tower returns nothing
  
 local Unit creep = Event.getTarget()

 
set Poisoned_heart.applyCustomTimed(tower,creep,tower.getLevel(),6+tower.getLevel()*.1).userReal = 25. + 1 * tower.getLevel()
 
endfunction