Mist Form

Become a drifting mist. You fly, breathe underwater and take no damage, but you cannot attack or use your hands. It is your way out: you can turn to mist even while someone holds you, which slips their grip and shakes off stuns and anything pinning you down. In a fight, press the key again to change back. Out of combat the shape holds as long as you like, its timer only running down while you fight; there, pressing the key again changes you back and pressing another form's key changes you straight into that one, both for free.