Winged

A young man's life is changed completely, when he finds out that, not only is he not human, but he is the heir of a magical land where his mere presence becomes a threat. First of a series.
There are two worlds, the "real" one in which we live, and a magical one where the fantasies that populated our world's imagination come from. Leo is a young man from the real world who discovers he is a descendant of an extinct race of magical beings, the birdmen. Being one of the last known members of his kind, traditions and complications dictate that he is to inherit the throne of the birdmen kingdom in the magical world. But not all are happy with this news, on the day of his crowning a masked figure from the birdmen's bloody, war-torn past appears. "As long as you remain, your kingdom will never know peace" it says, "I will make sure of it."