In the recent X-Men: Hellfire Gala, Orchis launched a multi-prong attack that destroyed the mutant nation of Krakoa and appeared to kill most of its populace. It marked the beginning of a new era known as The Fall of X, but longtime readers of books like writer Kieron Gillen's Immortal X-Men know that Krakoa's destruction came to fruition thanks to many of the misadventures and machinations of the nation's ruling body, the Quiet Council.
Source:https://www.cbr.com/immortal-x-men-fall-of-x-kieron-gillen-interview/