Lich (Polymorph)

"Want to look like a lich without all the bother of manipulating your own soul? Illusion's your friend! Just work magic from this school and before you can say "Mannimarco's a s'wit" you're a figure of necromantic majesty."—Othreloth Hlaalo, Illusionist

Source: in-game description.

This model is used for the Lich polymorph.