Collects Uncanny X-Men (2016) #16-19, Annual #1. The X-Men confront
the Inhumans in the most uncanny conflict of all! Since the discovery
that the Terrigen Mist - the key to unlocking an Inhuman's hidden
potential and powers - is lethal to mutants, the X-Men and Inhumans have
been locked in a cold war. But now things are heating up, and about to
boil over, as the X-Men are forced into drastic steps to ensure the
future of their species! But when Magneto goes too far, what will be the
repercussions of his dramatic actions when the battle ends? When she
left his team, Psylocke vowed that if Magneto stepped out of line, she
would end him. Is she about to make good on that promise? Plus: A dead
X-Man returns, and so does Domino!