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Klagens are jellyfish-shaped E-Series robots created by Dr. Eggman. In Sonic Heroes, they interfere with the player's team by hovering over a team member and trapping them in a holding beam. The trapped teammate cannot be used until the Klagen is destroyed.

A gold-plated Klagen model also exists, but rather than just holding a teammate in place, it will abduct them and carry them away to another part of the stage.