function AbilityCast_Timer .........
local timer t = GetExpiredTimer()
.....
call DestroyTimer(t)
set t = null
endfunction

local timer t = CreateTimer()
call TimerStart(t,15.00,false,function AbilityCast_Timer)
set t = null

local timer t = CreateTimer ()
call SaveUnitHandle ( udg_Hash, GetHandleId(t), 1, GetTriggerUnit() )
call TimerStart ( t, 15.0, false, function AbilityCast_Timer )
set t = null

function AbilityCast_Timer takes nothing returns nothing
local timer t = GetExpiredTimer() 
local integer h = GetHandleId(t)
local unit u = LoadUnitHandle ( udg_Hash, h, 1 )
call UnitRemoveAbiluty ( u, 'A000' ) // A000 - id способности, которая удалится
call RemoveSavedHandle ( udg_Hash, h, 1 )
set u = null
call DestroyTimer (t)
set t = null
endfunction