Header

    globals
        BuffType boekie_spiderling_slow 
    endglobals
    
    //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
        local Modifier m = Modifier.create() 
        
        call m.addModification(MOD_MOVESPEED,-0.05,0) 
        set boekie_spiderling_slow = BuffType.create(4,0,false)
        call boekie_spiderling_slow.setBuffIcon('@@0@@') 
        call boekie_spiderling_slow.setBuffModifier(m) 
        call boekie_spiderling_slow.setStackingGroup("boekieSpiderlingSlow")  
        
    endfunction

On Attack

function onAttack takes Item itm returns nothing
local Tower  tower = itm.getCarrier() 
local real  speed = tower.getBaseAttackspeed()  

    if tower.calcChance(0.25*speed) == true then  
       call boekie_spiderling_slow.apply(tower,Event.getTarget(),1)    
    endif 
    
endfunction