- Which faction is stronger? (Necropolis, Tower, or Conflux)

I understand that this might not be entirely relevant, but if I remember correctly, not all spells affecting the mind work, or rather, they don't work on everyone.
If my memory serves me right, in such cases, they become as vulnerable as Necropolis creatures, even though those have complete immunity to blindness and, I think, to berserk (which used to annoy me a lot).
P.S. I think that undead and elementals are two races that are completely opposite to each other, meaning undead don't get skeletons and don't replenish their losses by using bones.