Multi-headed dragons that cannot be killed by conventional means. Severing one head means two grow in its place. The stumps of the severed heads had to be seared with fire to prevent new heads from growing.
The hydra is a seven headed serpent monster that grows 2 more heads every time you cut one off. Hercules cut off a head and sealed it with fire, which made them stay cut off and gone so they could...
Hydra was a sea serpent with nine heads and was killed by Hercules. Hercules found that when ever he cut off a head two more heads would grow back. Hydra also had poisonous fumes that made Hercules...