Uncanny X-Men #16

...CORRUPTS ABSOLUTELY The DARK ARTERY, gateway to an underworld of unspeakable evil, has taken one of the Outliers and it will take the Uncanny X-Men to get them back...IF they can survive the corruption process needed to enter! Plus, the secret of the ENDLING at last! It's MONSTERS vs. MUTANTS for the soul of an Outlier! Don't miss this story finale!

Written by Gail Simone. Art and cover by David Marquez.