Hydra

Hydra (Hydra in Latin) is in Greek mythology the daughter of the stout giant Typhoon and Echidna, half woman, half snake. She's a monster herself with a snake body and nine dragon heads. She lived in the swamps near the town of Lerny in Argolida. She was destroying the neighborhood, people couldn't do anything against her, because one severed head grew into two. One of her nine heads was even immortal. It wasn't until Herakl, the hero, that Lern Hydra found her slayer. Her killing was also the accomplishment of a second task imposed on Heracles by King Eurystheus, and it was a task beyond human power, impossible for normal mortals. Heracles took Iiolas, the son of his half-brother Ifikel, with him to carry out this task. That's because even Hydra had her sidekick, a giant crayfish with sharp claws.

Héraklés started the battle with Hydra by setting fire to the forest behind the Lerno swamps, cutting off Hydra's retreat path. He then lit his arrows in flames and began a duel with them. It irritated Hydra, and she lunged at Heracles, who chopped off her head, but which was immediately replaced by two new ones. A huge crayfish bit into Hercules' leg, But Ioláos promptly defused him. Hydra looked back at the killed crayfish, which was exploited by Heracles, snatching a burning tree and burning its head so that the new one never appeared in its place. This was gradually done to other heads, including the immortal one. The charred remains of Heracles's body were buried deep in the ground, chopping up Hydra's body and clouding his arrows in her bile. The wounds inflicted by them were unhealable.