Hydra
The Hydra was a terrifying, immortal creature that guarded the road near Lerne, killing anybody who tried to pass by. The second labor of Hercules was an attempt to slay the beast, but soon he discovered a problem - one head was immortal. If he cut off any of the others, two would grow in its place. He had to enlist the help of his nephew Iolaus, who figured out that by burning and cauterizing the Hydra's neck stump, they could keep any of its heads from regenerating. As for the immortal head, they buried it under a rock.
Hydra
The Hydra was a terrifying, immortal creature that guarded the road near Lerne, killing anybody who tried to pass by. The second labor of Hercules was an attempt to slay the beast, but soon he discovered a problem - one head was immortal. If he cut off any of the others, two would grow in its place. He had to enlist the help of his nephew Iolaus, who figured out that by burning and cauterizing the Hydra's neck stump, they could keep any of its heads from regenerating. As for the immortal head, they buried it under a rock.