X-Men: Reign of X by Jonathan Hickman 1.

In a whole new world of possibility, Cyclops, Jean Grey and their extended clan make a Summer House for themselves — on the moon! But when an island full of unspeakable horrors appears on the horizon, the X-Men have their work cut out for them keeping their new homeland of Krakoa safe! As Earth comes to terms with the new global superpower, the mutant nation’s leaders attend an economic forum to show the humans who’s in charge now. And when the New Mutants return from space, they bring intergalactic trouble with them! The Brood! The Starjammers! The Shi’ar Imperial Guard! But what do they all want? Plus: When Storm is in danger, Emma Frost and Jean Grey must ride to the rescue! And an eerie adventure for the swashbuckling Nightcrawler!

COLLECTING: X-Men (2019) 1-9, Giant-Size X-Men: Jean Grey and Emma Frost (2020) 1, Giant-Size X-Men: Nightcrawler (2020) 1