From publisher blurb:
The Marvel Multiverse Role-Playing Game's first full-sized sourcebook is here, focusing on the Uncanny X-Men!
"To me, my X-Men!" This -- the first full-sized sourcebook for the Marvel Multiverse Role-Playing Game -- features the strangest super heroes of all: the X-Men and all their various spin-off teams, greatest allies and most fearsome foes. Written by d616 System co-creator and New York Times-bestseller Matt Forbeck and packed with illustrations by Marvel's incredible army of artists, the X-Men Sourcebook is jammed full of vital information about Marvel's most popular mutants, including dozens of new profiles for characters from X-Force, New Mutants and Marauders. It also includes full-color maps of famous X-Men homes, including the Xavier Institute, Krakoa and Arakko, plus plenty of plot hooks for an entire campaign. Answer the call and join the X-Men!