Marvel: Life-Force Absorption

Selene Gallio
Selene can psionically drain the life-forces of other human beings into herself, by physical touch. If she drained a person's entire life-force from him or her, the victim dies and the victim's body crumbles into dust. It is unknown how often Selene must drain life-force from another human in order to survive. A side-effect of this absorption is that Selene takes on the memories of her victims. Great exptenditure of power causes Selene to age, but she can rejuvenate herself by absorbing more life-force. Selene will not age as long as she maintains her supply of absorbed life-force.

Thomas Cassidy (Black Tom Cassidy)
Cassidy could drain the life-force of organic beings.