Mutagen

MUTAGEN
Type: P Action: Complex
Range: Self Duration: Sustained

A being can use the Mutagen power to magically enhance its physical body at the expense of its mental abilities. While using the power, it can shift a maximum of (Magic) attribute points from Mental to Physical attributes. This power can be used by possessing spirits, shifting Mental attribute points from the spirit to the vessel’s Physical attributes. Shifting in or out of mutated form requires a Complex Action. Instead of shifting attribute points, a gamemaster may choose to use this power to generate a new physical feature, like a tail, claw, or new eye.

(p196 SG)