The spirit of prophecy that delivers quests and predictions to demigods. Originally housed in a mummy at Camp Half-Blood's attic, the Oracle's spirit was later transferred to Rachel Elizabeth Dare, a mortal who can see through the Mist. The Oracle delivers prophecies in cryptic verse, and every quest begins with a prophecy that the questers must interpret (usually incorrectly, at first). The Oracle's prophecies are the narrative engine that drives many of the series' plots.