Thought of another name or two which hasn't been taken as far as I can tell.
Mancer
or
'Mancer
There are loads of games called _____mancer, but none just called mancer, with or without the apostrophe.
It would also allow for an endgame boss called Mancer or something-mancer.
Even an acronym like
Minions
And
Non
Corporeal
Entities
Risen
I was even trying to think of TBD acronyms:
The Battle Dimension
They Became Deities
Tactical Ballistic Demons
OK. I'm over thinking.this now.