Lucifian

A mutation of a baseform that allows absorption of living energy

Mechanics
With this mutation you can use the life drain and mana drain moves and have the passive mana absorb ability. But even beyond that, you can heal yourself for more lifeforce than you currently have as a maximum. To becaome a Lucifian you have to spend 5 improvement point. If you upgrade your Lucifian mutation, you will get something cool, but we're still discussing what exactly.

Lore
Lucifians usually have a bad name thanks to Michael Morningstar, the best known Lucifian out there. While the ability to drain life is usually perceived as something vile, it is not as if the power itself is stealing life force by itself. It is just that the psychological development of someone with this ability in an uncontrolled environment does not bode well for their ability not misuse that power. But, if taught how to cast healing spells or invert the flow of energy, they could use it as lifeforce transfusions, becoming perfect medics.