Uncanny X-Men #1

PROFESSOR X...IS GONE! A core group of essential X-Men rise FROM THE ASHES to face a world without a home - and without Professor X! All bonds among the mutant community seem to be slipping away, and ROGUE reluctantly finds herself as the hero designated to bring them back together...but a fearless, malignant power is out there hunting mutants, and it has a terrible secret that may destroy what remains of the X-Men!