Marvel Comics

The Marauders descend into the Morlock tunnels and slaughter an entire community of mutants in the crossover that changed the X-Men forever. Angel loses his wings, Colossus is paralyzed, Nightcrawler and Kitty Pryde are critically wounded, and the X-Men, X-Factor and New Mutants are all scarred by the violence. Chris Claremont, Louise Simonson and Walt Simonson deliver one of the most shocking and consequential events in Marvel history — a massacre that demonstrated no character was safe and set the tone for a darker era of X-Men storytelling.