Krypteia Knives Echidna is made by Evangelos Tsagkouros of Iceland. The Echidna fixed blade knife is made of O1 tool steel with a gun blued finish drop point blade and contoured green G-10 handles. Comes with a OD green kydex sheath. In Greek mythology, Echidna "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 known primarily for being the mother of monsters.