Catalyst

____Born in misery, she made a pact with a supernatural force, and gained unnatural abilities in exchange for her soul. Catalyst can drain the life force or energy of individuals or organisms, which can give her a series of powers: she becomes stronger, can heal any injury (the amount of energy required to fully heal depending on the injury), as well as telekinesis and mental manipulation.
____She can not only take the life force of an individual, but also infuse an already dead one with it, creating a kind of undead servant; they are not capable of thought, and are bound to their master's will. These undead are, however, easy to defeat in combat.
____With her abilities, she was able to climb her way to a place of power, and lives in a dark and haunting castle, somewhat far from the larger settlements. Those who regularly pass by the area know not to approach it, but it is a great danger to unaware travelers looking for shelter.

____She is not dependent on the power to survive, but if she goes too long without feeding, her colors become duller and she becomes weaker.