As I posted earlier, this villian was in Ravenloft - Jacqueline Montarri
She was "cursed" insofar as her actual head was gone but she could place another's head in it's place and could use the abilities/knowledge of the former owner of said head while she was wearing it.
I would guess that she could use abilities up to her level...but have no clue how to stat her I do believe she was a rouge...... and I plan on have her at level 15 or so
*edit* found out she started as a 5th fighter, but I still need her level 15 and don't see her as a defender.