New X-Men by Grant Morrison Vol. 1: E Is For Extinction

Collects New X-Men (2001) #114-117 & New X-Men Annual #1. Cassandra Nova has murdered 16 million mutants. Now she has her sights set on The X-Men! Xavier and his team of mutants have long dreamed of a time of peace. But the time for dreaming is over. Now it is time to fight.