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The Hydra is from Greek mythology and was an offspring of Echidna & Typhon. The Hydra is a many-headed serpentine creature. The number of heads a Hydra has varies from 5 up to hundred. Nine heads is the most common amount that Hydra are usually given. One of the heads of the Hydra cannot be harmed at all by any weapon, and any of the other heads that were cut off would grow back. Sometimes a Hydra's heads can breathe fire. The teeth from a Hydra are meant to have magical properties and it is said that a Hydra's teeth can raise skeletons from beyond the grave.
Thanks to Cristlefir for this information.