Shhhh.... he's secretly a dragon
He was once a dragon, the oldest dragon. So old, even he doesn’t remember his real name, only that most called him the Elder Dragon. But when one of the great powers attempted to destroy the world, he used his power to stop it and seal away the darkness. All magic has a price, and in sealing away the power, his price was steep. His body fell into a deep slumber under the earth, while his mind was rocketed into the void between worlds, lost for a long count of years. Until finally he saw a light and opened his eyes. His mind had melted together with a man named Peter, who lived in our world. The man had been in a comma for a long time, but finally woke, strong and changed, and unchanging. Having been in a comma from a car accident, his face was scarred, in the same patterns as the body of the dragon that now shared his consciousness. In this state, he is able to help and guide those around him, as well as weakly project his mind back to his home world to help guide the powers there.