Omega Red is harboring a deadly secret -- and now X-Force may have to cross a dangerous line to keep the nation of Krakoa safe! But nothing compares to the trust broken by the interrogation of one of their own. Plus, Forge, Wolverine and Quentin Quire brave the depths of the sea, where terrors of the deep await -- and a deadly discovery reveals a dark side of Krakoa! What does this mean for X-Force? And, shaken by his recent resurrection, what will Quentin Quire do with his new lease on life?

COLLECTING: X-MEN (2019) 15-19

Collects X-Men (2019) #16-20. One era ends and a new one begins as Jonathan Hickman's 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-nation's residents! And when the Shi'ar 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, it's been a very, very long time since they entered! And Krakoa's future is at stake when one of mutantkind's greatest threats re-emerges: Nimrod is online! Then, it's time for the Hellfire Gala - and a changing of the guard, as Krakoa's very first team of elected X-Men debuts!