The Marvel Cinematic Universe’s version of the Darkhold is going to get a bigger role in Doctor Strange in the Multiverse Of Madness. While Doctor Strange 2 will be helmed by the titular Doctor Strange (Benedict Cumberbatch), the film will also feature the next appearance of Wanda Maximoff (Elizabeth Olsen), who has not been seen in the MCU since the events of WandaVision. During that series, Wanda becomes aware of her true power as the Scarlet Witch. Her evolution over WandaVision's 9 episodes has led to numerous theories about what her role in Doctor Strange 2 will turn out to be.
WandaVision introduces a whole host of important plot elements to Scarlet Witch’s story, including the evil Darkhold book. Wanda first learns of it when she faces off with another witch, Agatha Harkness (Kathryn Hahn). Agatha reads a section of the Darkhold that’s dedicated to Wanda and her potentially destructive powers, which are also described as chaos magic. While little about the book is revealed beyond what Agatha shares, Wanda takes the Darkhold for herself after defeating the villainous witch and is last seen studying whatever dark secrets are contained within its pages.
On a recent episode of The Phase Zero podcast (via The Direct), Russell Bobbitt, a Marvel Studios Prop Master for WandaVision and Loki, discusses the Darkhold when asked about collaborating with the Doctor Strange 2 team. In revealing where WandaVision's version of the magical book came from, he shares it will play a major role in Multiverse of Madness.
The Darkhold’s larger role in Doctor Strange 2 makes a lot of sense following what the film’s trailers and posters have revealed about Wanda. Dark magic in the MCU seems to take a physical toll on its users, as evidenced by Agatha’s blackened fingers and eyes. Some Doctor Strange 2 promotional materials have shown Wanda with the same blackened features. It seems that Wanda has learned how to use dark magic from the Darkhold and will most likely call upon it during Doctor Strange 2. -Screen Rant