I've got it: Avolakias. They're big, wormlike creatures found in D&D's Monster Manual II (the 3.5 one), with poisonous mandibles, eight clawed arms, six tentacles with eyes on them, and the ability to raise the dead. They can also use the spell-like abilities (it's a long list):
Chill Touch, Cause Fear, Detect Magic, Halt Undead, Read Magic--Exactly what they say on the tins.
Disrupt Undead--Hurts undead some
Gentle Repose--Slows decay
Ghoul Touch--
Mage Hand--Minor telekinesis
Polymorph (self only, humanoid form only)--Turns the avolakia into a humanoid creature
Spectral Hand--Allows touch-range spells to be used at a distance
Enervation--Drains a creature's...energy...it gives negative levels.
Vampiric Touch--Drains HP from a creature
Suggestion--Convinces others to do its bidding
Also, avolakias are immune to cold, disease, energy drain, and paralysis; are resistant to fire; can heal quickly; and have a "defensive aura" that I could simulate by giving them a high natural skill in dodge. They'd be hostile to ogres but not dwarves. And did I mention that they can raise the dead?
Thoughts?