When the Prince is transformed, the Dark Prince would take his place in physical form. The Dark Prince was known for his burnt blackened body that seemed to flow with ghastly smoke, yellow eyes burning, its torso cast in crazed burning designs of sand; it's hair flowing upward like smoke and cinders, arms and back pocked with black scaly horns. He embodies every negative aspect of the Prince, his rage and pride giving him physical form and energy to feed off of. - http://princeofpersia.wikia.com/wiki/Dark_Prince