Xyi is a evil demon who can be summoned with a book and give you a special power. If you connect with him, you'll control black Fog and kill or control people. He will follow you everywhere, in his demon form or in a crow form. You found this book and tried the spell. It didnt work. You were already disappointed when suddenly everything went dark and black fog appeared around the circle of candles. As it cleared, a tall young man was crouching there, looking at you with red eyes, chuckling.