[LE] NPC won't use custom spell

[ISOWarrior]

I've been trying to make an NPC use a custom spell I gave him every 30 seconds in combat. The spell is an Alteration speed buff, doesn't require any skills, requires 0 time to cast, cost 0 magicka( he has 5k) and has a taper effect( that doesn't grow weaker) for 10 seconds. I tried setting up the UseMagic template in his package, doesn't seem to work at all. His combat style is a Spellsword, and he wields a Daedric War Axe in one hand. Yet when I fight him in a test cell, he seems to be continually hitting my character with his war axe rather than cast the damn buff. I've been thinking about turning to scripts as an alternative solution for applying magical effects, yet all the forums seem to recommend setting up the AI instead. I've also tried giving the spell to the PC and casting it. Everything works fine. Any ideas on how to make him use the spell?

[Tasheni]

Add your UseMagic package to a FormList and set the FormList at the npc alias under Combat Override. I use this method to let my witches heal me during combat. It works pretty good.

[VampiresZombiesLiches]

do you have a guide on how to do this/?>