From IO9: In the penultimate issue of Jonathan Hickman, Pepe Larraz, and Marte Gracia’s House of X, Charles Xavier’s grand plan to ensure that no X-Men ever truly die again is revealed. In the months since then, the concept of death has become something different for the world’s population of mutants. People carrying x-genes still face danger at every turn, even when they believe themselves to be relatively safe while living on the island nation of Krakoa.
But even when X-Men fall in battle, there are now protocols in place to bring them back to life, no matter the ridiculously devastating circumstances, because Charles Xavier—assisted by a key team of mutants with restorative powers—has devised a way to create backups of any person’s very “essence.” Strictly from a strategic point of view, this gives the X-Men a key advantage in their ongoing crusade to establish a mutant homeland. Case in point: Charles Xavier’s own resurrection after he was recently assassinated. [Spoiler Warning]