One era ends and a new one begins as Jonathan Hickmans acclaimed run enters the Reign of X! In the wake of the Earth-shattering events of X OF SWORDS, the Captain Commander of Krakoa makes a fateful decision that will affect all the island-nations residents! And when the Shiar Empire asks the X-Men for help, Cyclops, Storm and Marvel Girl answer the call! Elsewhere, the door to the Vault swings open at last. But time moves differently inside the Vault and for the beings who emerge, its been a very, very long time since they entered! And Krakoas future is at stake when one of mutantkinds greatest threats re-emerges: Nimrod is online! Then, its time for the Hellfire Gala and a changing of the guard, as Krakoas very first team of elected X-Men debuts! Collecting X-MEN (2019) #16-20. Rated T+