Necronomicon Ex-Mortis (The Book of the Dead) is made of human skin and written with human blood, the book is able to summon demons from Hell.
After reading the spells from the Necronomicon Ex-Mortis, demons rise from hell in the image of dead people, and the book is able to inflict evil on inanimate objects, making them merciless killers.
Eligos is a Demon of the Mind, causes mental suffering to people. He is able to control and manipulate people's thoughts, teleport to small distances, and also to live in the body of a living person, completely subordinating them to himself.
"The Dark Ones" is an ancient race of godlike creatures. Ruby is a bright representative of the Dark Ones, half-human, half demon. According to Ruby, she wrote the Necronomicon Ex-Mortis.
Little is known about Baal, a representative of the evil forces. For a long time he was Ruby's husband. Baal is a very clever and sly demon, able to manipulate people using the ability of telepathy and control over a person. Removing his skin he can pretend to be any person. The being possesses immortality, only the Book of the Dead can kill him (send him to Hell).
Demon Spawn is a dark-skinned human-like creature with empty eye pits instead of eyes and sharp animal teeth. The monster is extremely dangerous, has many supernatural forces. For example, the demon is quickly recovered from any physical attack, and is also very flexible and has the ability to climb on any surface. But most importantly, the creature can take immortality from other demons.