Marrow's mutant power is the ability to use her bones as projectiles and other weapons. Her bones grow at greatly accelerated rates, and when they run out of room on the inside, they simply stick out of her skin. She simply pulls them out and has instant tools at her disposal. Not to mention that the site of someone pulling bones out of their skin could stop an offender dead in tehir tracks. Apparently Sarah has a quasi-enemy in Storm, although until I get back issues I don't really know why.

She is currently a member of X-Men.

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