Written by Marc Guggenheim. Art and Cover by Ken Lashley. SECRET EMPIRE TIE-IN! When Manhattan is besieged, the X-Men open their doors and repurpose their school as a safe haven for any human or mutant in need of sanctuary. But little do they know that one of the humans they've welcomed in is the all-new X-CUTIONER! And he's about to make the Xavier Institute the last place mutants want to be…