Excalibur v01 - Forging The Sword (2004)

Collects Excalibur (2004-2005) #1-4.
The island of Genosha was once a thriving nation of mutants, built from the ground up by Magneto, Master of Magnetism. Then, an apocalyptic attack killed every man, woman and child-reducing an entire society to rubble within hours. Now, Professor X has come to Genosha with one intention: to rebuild a nation from its ashes!