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The Hydra was a mythological creature that dragged itself across the ground. It had a bulbous body and three eyes, one looking forward, the other two on the sides.

Inside the Citadel, Captain Richard Haliwell and Emily Boyes-Dennison were forced to face one of these during one of their tests for survival. Haliwell managed to blind the creature using his cutlass. (PROSE: Imperial Moon)

Another Hydra fought and killed a lion. Duke Ferdinand obtained some of its venom for Malcome Canker so he could use it to poison Jack Fuller. (PROSE: Minions of the Moon)