Ever since Marvel’s “All-New, All-Different” universe began, tensions between the Inhumans and Mutants of the Marvelverse have been high. Scott Summers supposedly died doing something to majorly tick the Inhumans off
. Terrigen mists are sterilizing and poisoning mutants
. And now, those tensions are boiling over.
Source: Gizmodo – The Inhumans and X-Men Are Finally Going to War