Oracle is not actually a person, he is a hologram created by Eremin's spell. He was first cast by the Triad to help Score, Helaine, and Pixel to get to Treen and then to give them clues. Due to the corruption of the magic, he was forced to speak only in rhymes and to not give the whole truth. After Sarman and the Triad were defeated, Score, Helaine, and Pixel recast him and his speech returns to normal because the analogue is fixed. Jagomath causes him to regain corporeal form in book twelve.