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if you mean a hydra a hydra is sort of like the dragons cousin. in Greek mythology (and don't quote me word for word on this) a hydra was represented as a multiheaded serpent. the Greek Demigod Hercules had to fight a hydra once and it was VERY hard, because hydras have a regenerative ability. If you are fighting a hydra say it has...10 heads, you cut one off 2 new ones take its place, lop 3 off you now have a 15 headed hydra on your hands, not good.
The way Hercules defeated the hydra was that once he cut one head off he quickly burned the neck of the severed head and NONE regrew in its place. he repeated this prosses until he had all but 1 head off, and here my memory goes fuzzy, which may have been the dominate head or the hydra has another ability, though I'm thinking its the latter, ANY WAY! this one would not STAY DEAD, yes 2 more did not regrow and the body did stop living, he burned it, but the final head of the hydra is immortal even when severed from the body, so Hercules wrapped the head in a cloth and buried it under a rock i think.
