Uncanny X-Men #520 (2010)

Utopia was recently invaded by Predators X who were full of nanobots.  One escaped.  Wolverine, Psylocke and Colossus track it to New York’s sewers, where they find Fantomex–who just killed it.  But then he acts like a jerk so the X-Men move on to find out who sent the Predators X to Utopia.

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Fantomex killed the monster at the request of a young mutant he’s befriended.  The kid tells him he should join the X-Men.

Meanwhile, Magneto and Sub-Mariner build a pillar under Utopia to help keep it afloat and also be the new home for Atlantis.  Cyclops doesn’t want Magneto’s help, and they argue, but nothing really changes as a result.