[@BCTheEntity] Well I wanted to have a character that was a sentient knight who was brought back from the dead consciousness and a voice, but no flesh or senses beyond sight. Something like that would require a lapis in or on the skeleton, binding the souls there, at least, to keep it from being OP.

Of course, there could also be a Lapis that just animates corpses, gives them an artificial soul or maybe just restores all their organs but leaves them as soulless husks without any intelligence beyond following orders. As for corrupting influence; I think you'd already have to be pretty corrupt to disrespect the dead so heavily. I'll say no, the necromancy has no negative mental effects, but will wear on the user physical the more he abuses the Lapi.

EDIT: Oh shit I just thought of something cool. Okay so Demons can't master Lapi, and that's because they have no souls, and souls are what allows a person to master and shape lapi. Maybe every time you use a necromancy spell, you have to break off a piece of your own soul to place in the cadaver. Using it too much makes it harder, and eventually impossible, to master and manipulate Lapi. Of course, that's just a thought.