What if Legion killed Magneto and Xavier? With no leader to create any incarnation of X-Men to resist the onslaught of Apocalypse, the new world is a horrific finalized vision of Apocalypse's dream. On the dawn of the twenty-year anniversary of the murders of Magneto and Xavier, we follow a small group consisting of Earth's remaining heroes, led by Nate Summers as they stage a final offensive in an attempt to escape this twisted reality altogether.
— Description from Comic Vine community (comicvine.gamespot.com).
