Bairsten Prime

Bairsten Prime is a world contested during the War of the Spider in the Psychic Awakening of M42. No segmentum, system, or galactic coordinates are firmly recorded. Fabius Bile, having stolen the Ark Cornucontagious and allied with the Shriven, fought there and captured Adeptus Custodes and Sisters of Silence as experimental subjects before the campaign moved on to Dessah.