Still working on sheet
EDIT: Uh, curious, about a magic/fighting style/concept.
Golem possession.
Basically, creates a golem, then possesses it, leaving the character's real body in...well...a comatose state?
Damage taken as a golem is a numbing pain, but 'death' in a golem is a searing pain, one that forces them back into their real body most likely curling up in agony.

A more gentler way would be to 'eject' out back into their body, although the character is useless by themselves.