Bairsten Prime was an Imperial Mining World that had once been a major source of duralium ore. It was devastated by the effects of the Great Rift's birth and its population was either killed off or abandoned the planet soon after. As a result it was later designated a Derelict World.
During the War of the Spider in the Era Indomitus, Bairsten Prime was ravaged by the forces of Fabius Bile and The Shriven, who were later confronted by a force of Adeptus Custodes under the command of Shield-Captain Tyvar. Bairsten Prime then became the site of the second major battle of the War of the Spider, which ended when all sides withdrew and left the world abandoned once more.
Sources[]
- Warhammer 40,000: Rulebook (8th Edition), pg. 161
- Psychic Awakening: Pariah (8th Edition), pg. 74
- Psychic Awakening: War of the Spider, pp. 12-15