Pls help

can someone pls showme how u can make immolation add defence to your character when it is activated.

Immolation does not have a add defence field for armor. You'd need to either use a different ability or trigger it.

trigger it, when unit gains imolation give it the buff devotion aura, when unit loses imolation remove devotion aura, might have to check every few sec

You can't just add a buff with triggers, and even if you could, it would be meaningless, because buffs don't give the effect, the spell that creates the buffs does. So, if you alter vampiric aura to grant the devotion aura buff, it will still give life drain, not bonus armor.

What you would have to add/remove to/from the unit when it casts/stops casting immolation would be an item bonus armor ability. To detect if immolation is on or off, use a periodic trigger that checks for the immolation's caster buff. If it's on, add the bonus armor ability to the unit if it doesn't have it yet, and if it's off, remove the ability.

Sorry I ment ability not buff. I use a modified devotion aura in my enfo map in triggers because item bonus armour was already in use and war3 is finicky about stacking things based off the same type.

Is it? In my experience, different item bonus abilities, even when based on the same ability, stack quite nicely. It's what makes the whole bonus mod possible.

The one thing warcraft really is finicky about stacking are orb attack effects and evasion, but that's it as far as I know, unless you also want to count the orderID conflict which disallows a unit to have two activated abilities based on the same one.