The Darkhold, also called the Book of Sins or the Book of Spells, is a book with mystical abilities.
The Darkhold was said to contain infinite knowledge. Over the course of history, many individuals searched for it, including Red Skull, Daniel Whitehall, and Nick Fury. In the 21st century, Lucy and Joseph Bauer found it in the basement of the home's former owner and opened it. When Lucy touched it, she discovered she could read the text in English. When Joseph touched it, he could read it in German. As she studied the Darkhold, Lucy became obsessed with it.
Momentum Labs, the scientific research corporation that the Bauers worked for, sought to use the secrets within the Darkhold to building a Quantum Particle Generator. The device was originally designed to use the mystical properties of the book to create matter out of nothing, but the experiment went horribly wrong as the machine exploded and transformed Bauer and three of her co-workers Hugo, Frederick, and Vincent into spiritual entities. This caused engineer Eli Morrow to beat Joseph Bauer into a coma enough for him to end up incarcerated at South Ridge Penitentiary. Years later, Lucy visited Joseph and snapped him out of his coma to get the current location of the Darkhold.
Upon heading back to where the Darkhold was found by her and Joseph, Lucy found herself unable to read it in her current state. In order to get the Darkhold read, she and her remaining ghosts Hugo and Vincent had to infiltrate South Ridge Penitentiary in order to spring Eli Morrow from his prison. Lucy was successful in her mission at the cost of Hugo and Vincent who were taken out by Ghost Rider. At the Pasadena Momentum Laboratory after killing the security guards there, Lucy has Eli touch the Darkhold and the text appeared before them in Spanish.
- In the comics the Darkhold is the ultimate dark grimoire, a collection of all evil spells in existence that was gathered by the Elder God Chthon. It serves as the anti-thesis of the Book of the Vishanti.
- The cover of the book features an ambigram, that is, the writing on it reads "Darkhold" from both directions.
- Agents of S.H.I.E.L.D.