[@Flamelord] They have low life force you say? 

Have you perhaps met ... [url=https://www.youtube.com/watch?v=GOGq39FBZEY]The Gatekeeper[/url]?

Them super Kull zombies. 

More seriously, the fact that they have a short life does seem like a glaring weakness toward energy sapping foes like this. Ba'al better prepare them snipers.