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The Krabs unleashing the Pulse Beam.

The Pulse Beam is a weapon employed by Krabs. It is the only weapon of X.A.N.A.'s monsters that has yet to hit a Lyoko Warrior. The Pulse Beam is located on the underbelly of the Krab. When activated, a powerful beam of light is emitted, and is believed to cause immediate devirtualization. It has only been seen twice in the series; once in The Chips Are Down, and again when a Krab nearly uses it on X.A.N.A. William in Wreck Room.