Whats an Oracle?

I bet you guys are wondering what an Oracle is since I made it in the title. Any ways here is the description of an Oracle. An Oracle is somebody who has come to his last spell and completed it, this only happened 1,000 years ago when all the Oracle escaped the end of the war in a huge war vessel. The vessel was shout down with a enemy cannon ball and all of the Oracles drowned in the sea.