Lifeforce was a member of the second incarnation of the Dark Riders. Her mutant ability enabled her to suck the life out of her enemies and absorb their strength into herself. She was also well-trained in hand-to-hand combat. Along with the rest of the Dark Riders, she was sent out to hunt down mutants found unfit by their master, Genesis. Their first target was former Dark Rider, Foxbat. Lifeforce maliciously sucked the life out of him, leaving him for dead. Later, as the Dark Riders went up against a few of the X-Men, Lifeforce battled Domino, but was defeated. Lifeforce eventually joined her comrades, Spyne and Hurricane, in breaking the mutant Cyber out of prison. She was killed during the adamantium process on Wolverine after he rejected the adamantium, causing shrapnel to stab into her body. Genesis, unaware of her death, continued to order her until he saw her corpse lying in the rubble.