In Greek mythology, Echidna (; Greek: Ἔχιδνα, "She-Viper") was a monster, half-woman and half-snake, who lived alone in a cave. She was the mate of the fearsome monster Typhon and was the mother of many of the most famous monsters of Greek myth.
In Norse mythology, Garmr or Garm (Old Norse "rag") is a wolf or dog associated with both Hel and Ragnarök, and described as a blood-stained guardian of Hel's gate.
