X-Men: Reign of X by Jonathan Hickman, Volume 1 (X-Men Vol. 6 #1-9)

Jonathan Hickman reinvents the X-MEN! 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! Meanwhile, Earth must come to terms with the new global superpower - 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 and GIANT-SIZE X-MEN: NIGHTCRAWLER.