Brendok Fortress used to be a mining operation situated in the Northlands region of the planet Brendok. It was later annexed by a coven of witches, with Mother Aniseya as their leader, after they were exiled. They lived peacefully there for a number of years throughout the High Republic Era.
The design for Brendok Fortress, which first appeared in the television show The Acolyte in 2024, drew inspiration from two sources. One was the 1947 British film Black Narcissus by Michael Powell and Emeric Pressburger, which takes place at a mountain retreat for nuns in the Indian Himalayas. The other was the Hoover Dam located in the United States.