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|Appeared in||Wolverine and the X-Men: Foresight|
Marrow is a Mutant from the future.
Sarah has the ability to enhance the growth of her skeletal structure. Her mutant physiology allows her to rapidly regrow the bone spurs which protrude from her body, which she uses as weapons. She utilizes this power in many ways, including the creation of knuckle guards, spears, and projectile spikes.