"Codex Gigas" (The Devil’s Bible) by Unknown Author

The Codex Gigas, known as the "Devil’s Bible," is a massive medieval manuscript with a striking illustration of the devil. Created in the early 13th century, its sheer size and the dark legend of its creation—said to involve a pact with the devil—add to its eerie reputation. The book's ominous imagery and the lore surrounding it give it an unsettling presence.