The Echidna ["She-Viper"] is also known as the mother of monsters. Some of her known off-spring are the Cerberus, the Hydra, and the Gorgons who would be the parents of the famous three Gorgon sisters.In some records, the Echidna is said to be immortal, while in others she was killed on Hera's orders. Her spouse Typhon was killed by Zeus and sent directly to Tartarus.