Psionic powers are magic in everything except it's name. And despite those pesky details, Ulitharids are a powerhouse. Skeletons have a Challenge Rate of 1/3 (although our Irate one could possibly reach a solid 2), just as orcs. Ogres have a CR of 3. Ulitharids have a CR of 12. It's just way above the intended level of the players for this RP.

Playing one is fine as long as he's watered down by quite a bit. And this should be coupled with a very consistent RP to ensure the character doesn't spirals out of control.

With those problems aside, I wanna see what you come up with.