Hydra is a nine-headed sea serpent who guards the entrance to the Underworld from Earth, called Lerna. Her breath, blood, and saliva are poisonous, and her heads regenerate when they are severed.
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HYDRA Hydra is a nine-headed sea serpent who guards the entrance to the Underworld from earth, called Lerna. Her breath, blood, and saliva are poisonous, and her heads will regenerate when they are severed.