Hydra

Hydras are a breed of reptilian magical beasts that have anywhere from five to twelve heads. They are especially deadly monsters, since whenever a head is severed, two new ones grow in its place. While not very intelligent, hydras are usually neutral in alignment.

Lairs
Hydras are deadly creatures that typically live alone in fetid swamps and waterways and are generally always the most dangerous predator in whatever area they inhabit. These creatures have huge bodies and a mass of serpentine heads.

Ecology
A hydra is an especially deadly monster, since every time a head is severed, two new ones grow in its place. A hydra is not very intelligent, about as much so as an animal.

Subraces

 * Cryohydra : This is a relative of the standard hydra that is able to breathe frost from its heads.
 * Lernaean hydra : Another relative of the standard hydra, this one able to breathe poison clouds.
 * Pyrohydra : Another relative of the standard hydra, this one able to breathe jets of fire.