Once they have passed the Siren's island, Odysseus and his men must navigate the straits between Scylla and Charybdis on their epic journey. Scylla is a six- headed, and twelve-legged monster who, when the ships pass, swallows one sailor for each head. The Scylla ends u eating six of Odysseus' men. This creature has supernatural powers.
Image from http://raveworld.wikidot.com/local--files/minotaur/Minotaur01.JPG.