Of all the hidden millennium items, one is not mentioned in the Book of Death. The Millennium Heart is told of in the book of life as the only millennium item not used to seal away the shadow games. Instead, a spirit of great white magic is hidden within.
Legend tells of the time when it's power will be needed once again. When that time comes the Pharaoh himself will unlock the spirit and fight along side it into the light. When the spirit awakes, all dragons will stop and cry a river of stars. For their Queen has returned to the blue eyes of life.
Beware the priests that wish to return the world to darkness. They will try to destroy the Heart before the spirit can awake. But when the spirit is released, the guardian of the Heart will die.