Damien hopelessly falls in love with a human and has no power over it. He loses his mind when he's around her because his love for her is that strong. When people start attacking her because of him he can't handle it and kills everyone who even tries to harm her, he becomes the executor and puts people on death row that is a threat to his loved one. If you want to get in between Damien and his love, don't bother because the only thing you'll accomplish is a space in the grave yard.