Slay the nine-headed Lernaean Hydra.

Hera raised the Lernaean Hydra because she wanted to kill Heracles. But could slay this monster.

Hydra had nine heads, just one of them was dead.

Iolans, Heracles's nephew helped him with his work. It was very hard. Monster had poison fumes.

Heracles cut the head with golden sword. So, Heracles made his second Labor.