Recharging mana would be nice.
Also, there *are insanely high resistances in creatures that make the fear skill and the curse skill near useless at one or two skill points...
Very expensive to spend 5 skill points on either of them just to reasonably curse a basic enemy lowly enough to use polymorph or charm.

Necroshift dissapointedd me as well.. at level 24 and beyond (it seems, ,If i'm wrong someone please tell me)
it allows you to inhabit a dead creature but the creature you inhabit can't attack most other creatures...unless the 'other creatures' are that creature's natural enemies. With necroshift i'd like to be able to attack anyone I want...I thought that skill would increase my power greatly but its only a cute looking invisibility spell, really.