Marvel's Fall of X event is well under way, and as Earth's Mutants fight back against an unprecedented threat, X-Men readers are asking, where are Earth's most powerful Mutants, Apocalypse and Legion? Anti-Mutant organization Orchis attacked the X-Men's annual Hellfire Gala, killing scores of Mutants and their human guests, while blaming Mutants for the devastation. The Mutants who survived were either exiled to other worlds, or forced into hiding on Earth. Orchis has been hailed as heroes by the Earth's human population, and Mutants are reviled and hunted by their friends, families, and neighbors. The situation has never been more dire for the X-Men and their people, and yet two of their most powerful allies haven't been seen in months.
Source:https://www.cbr.com/marvel-most-powerful-mutants-fall-of-x/