In the mirror universe, the Tholians were an extremely xenophobic, non-humanoid civilization native to the planet Tholia in the Alpha Quadrant. The Tholian interstellar state was the Tholian Assembly, which was bordered the Terran Empire and the Klingon Empire during the 23rd century. (VAN - Mirror Universe short story: "The Black Flag"; TOS - Mirror Universe novel: The Sorrows of Empire) During the mid 24th century, the Tholian Assembly was one of the parties to the Raknal Accords which banned the use of trilithium explosives to detonate stars.