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Day of Reckoning, Part 2 - The X-Men, along with their new teammates the Brotherhood, engage Magneto, but not before they learn about a traitor in their midst! While the battle rages on, Magneto caves in the ground unleashing the deadly Sentinel robot. The few mutants who manage to make it away from the Sentinel retreat back to the mansion only to discover that it’s been destroyed! Who could be responsible?