Marvel is raising the stakes for the X-Men in the epic crossover event X of Swords. Since House of X and Powers of X, mutants have become functionally immortal thanks to the resurrection protocols put in place on Krakoa. Using the combined powers of The Five — Hope, Elixir, Egg, Proteus, and Tempus — Krakoa can restore a fallen mutant’s body. With Professor X’s power and Cerebro storage, Xavier can restore that mutant’s mind and memories to them. But the X-Men just discovered a flaw in the system, and one X-Man paid the price for being the first to encounter it. SPOILERS for X-Factor #4 by Leah Williams and Carlos Gomez follow.