A very powerful member of the Tuatha Dé Danann, Cernunnos, the Horned One, Lord of the Dance, Giver of Gifts, is known by many names: Gwynn ap Nudd, White Son of Night, Lord of the Underworld; Woden; the Green Man; Herne the Hunter; Serpent Son; Wish Huntsman; Robin Hood.
A powerful member of the Tuatha Dé Danann, with an almost limitless library of knowledge buried within his mountain, there is almost nothing that Ogma does not know.