In Hittite mythology, Illuyanka was a serpentine dragon slain by Tarhunt, the Hittite incarnation of the Hurrian god of sky and storm. It is known from Hittite cuneiform tablets found at Çorum-Boğazköy, the former Hittite capital Hattusa. The context is a ritual of the Hattian spring festival of Puruli.
The myth is found in Catalogue des Textes Hittites 321, which gives two consecutive versions.
"An dragon god that appeared in ancient Hittite legend. A violent god, he rules the sea. In many cultures around the ancient Orient, the rough waters and the river floods were often likened to dragons. There are many legends about him, including a tie when he fought the main god, the god of storms, in which he showed power greater than his opponent."
—Shin Megami Tensei IV Profile
Illuyanka is faced in the Challenge Quest, Slay the God of Violent Winds. Having defeat the God of the Storm and stealing the gods heart and eyes, he is now residing in the area of Akasaka on the world map of Infernal Tokyo.
