"True art is merely a matter of drawing inspiration from the proper sources."
Dr. Freeman is a master of surgical transplants and inter-species grafting. He may perform a surgery that permanently alters the body of his patient by incorporating a part from another creature. This can range from a facial transplant to replacing a lost arm with a tiger's paw.
Exert your Mind, choose a living target within Arm's Reach, and spend 15 Minutes performing your surgery. You must roll Intelligence + Medicine, and the target may resist by any physical means provided they are not restrained, unconscious, or incapacitated.
If you are successful, you may incorporate a part from another creature's body into theirs, potentially changing their body in a drastic way. The alteration may be aesthetic, debilitating, or even provide some functional benefit. Dice bonuses from beneficial augments are limited to +1 die for relevant actions, or to simple beneficial traits possessed by mundane animals, such as gills for water breathing
Your alteration either counts as a new Battle Scar or changes the nature of an existing Battle Scar.