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The Lernean Hydra is a creature with origins in Greek mythology, legend and folklore. The first was one of many offspring from the divine monsters Typhon and Echidna.
The Hydra was battled by the hero Hercules as the second of his twelve labors; he killed it with the help of his nephew using his sword and a torch to burn off the bleeding stumps after he severed one of the heads. The last head, which was immortal, was kiled when Hercules beat it to death with his club and buried it after ripping it off. The hero then dipped his arrows into the monster's venom, making them poisonous.
Basically like a snake or dragon with many heads.
One of the Hydra's most well known abilities is it's regeneration. When one of its heads is cut off, two would instantly grow back. Also, it can shoot potent acid, has poisonous breath, and blood that is also poisonous. In fact, the blood is so virulent that even so much as SMELLING ITS FOOTPRINTS can kill a man!
The only way to combat it is to burn the stump before the two heads can grow back. However, a word of warning: do not attempt to slay; only demigods have been known to slay them, many heads equals death.