'Worms of the Earth' is a dark fantasy story by Robert E. Howard, first published in 1932. Set in the world of Roman-occupied Britain, the tale follows Bran Mak Morn, the last king of the Picts, as he seeks revenge against the oppressive Roman Empire. When a Roman official publicly tortures and humiliates one of Bran's people, the Pictish leader turns to an ancient, forbidden race— the Worms of the Earth— for help in exacting his vengeance.

The story weaves together themes of revenge, the clash of civilizations, and the consequences of delving into ancient, forbidden powers. Howard's portrayal of the Worms as grotesque, primeval beings who once ruled the Earth adds a chilling layer of horror to the narrative. His evocative writing paints a vivid picture of a world where myth and reality blend, and where dark forces linger beneath the surface.

'Worms of the Earth' is considered one of Howard's finest works, showcasing his talent for combining historical adventure with supernatural horror. It highlights the tragic heroism of Bran Mak Morn, who, in seeking justice for his people, risks his own soul by unleashing ancient horrors.