Throne of Nightmares (original) Kerri Maniscalco

Prince Sloth hates leaving his enchanted library, but when a forgotten deity threatens the very fabric of the Underworld, he's thrust into a race against time. He must find the Book of Nightmares - an ancient artifact that has the power to break worlds - before it unleashes a deadly game to free its master, the Goddess of Night. When a betrayal leaves him marked, and desperate, his path collides with a young woman who possesses the legendary Phoenix Tear - a portal stone unlike any other.