Marvel Masterworks: Uncanny X-Men Vol. 5
Chris Claremont, Mary Jo Duffy, and Bob Layton (Writers); John Byrne, Klaus Jeanson, Dave Cockrum, George Perez, Alfredo Alcala, Ricardo Villamonte, John Romita Jr., and John Buscema (Artists)
Gathered together by Professor Charles Xavier to protect a world that fears and hates them, the X-Men had fought many battles, been on adventures that spanned galaxies, grappled enemies of limitless might, but none of this could prepare them for the most shocking struggle they would ever face. One of their own members, Jean Grey, has gained power beyond all comprehension, and that power has corrupted her absolutely! Now they must decide if the life of the woman they cherish is worth the existence of the entire universe! And if that wasn't enough, brace yourself for a brouhaha with Wendigo and the seminal story of that furry blue elf Nightcrawler in "Nightcrawler's Inferno".
Uncanny X-Men (first series) #132-140, Uncanny X-Men Annual (first series) #4, Phoenix: The Untold Story, Bizarre Adventures #27