Undead Warrior no losses?

[Infiltrator]

Yea it's kinda low. Since I made this thread I've decided to go with the demon route and even with a 100 lowest HP unit (succubus) I sometimes have problems with AoE like giants stomping. I solve those by putting pentagram below my demons to raise morale and thus defense.

But I don't know how you would protect the zombies from such attacks without having to waste stoneskin or some other spell on them.

(I'm considering this is a no-loss game).