Nightmare

A creature of the Modern Age, Nightmare made their unsettling entrance in X-Men: Legacy #245 in 2011, brought to life by the acclaimed team of Mike Carey and Clay Mann. With only a handful of catalog appearances, this is a rare, enigmatic presence — the kind of shadowy figure that haunts the margins of Marvel's mutant world, sharing pages with heavy hitters like Ororo Munroe, Scott Summers, and Jonothon Starsmore across the reality-bending Age of X storyline. Scarcity has its own allure in comics, and for collectors drawn to the stranger corners of the X-Men universe, Nightmare is exactly the sort of elusive discovery worth tracking down.