Could someone help me with necro ai?

Could someone help me with necro ai?

I have a map that you must survive waves as a team and there is a period where necros come out.. they dont always cast raise dead and cripple and unholy frenzy when they should.. often they sit there with full mana til they die.

i managed to make a trigger that orders them to cast say.. cripple on a unit when it's within about 500 range.. but i'd rather just do an ai.. and that trigger seems bugged.

can anyone help me out? i've never played with ai before.

U cant let units cast spells with AI. AI is for what kinds of units the cmputer builds, u can make ur own AI in the AI-Editor, its really easy (I think )

The necros don't cast spells? Are the necros that attack controlled by a computer player? if they r, I dunno