In the dim light of an old basement, three young summoners gathered around a chalk circle drawn on the cold stone floor. They were brothers, Alex, Ben, and Chris, all in their early twenties, excited and a bit scared. The basement was their grandpa's old workshop, full of dusty shelves lined with rusty tools and forgotten boxes. Cobwebs hung from the low ceiling, and the air smelled musty, like wet earth after rain. 

They had found an ancient book in the attic, its leather cover cracked and yellow pages filled with strange symbols and spells. It talked about calling demons, and the one that caught their eye was a succubus—a...