Vyaniah is a Hive World that is located in the Khymaran Drift Sub-sector of the Badab Sector of the Segmentum Ultima. In 902.M41, just before the outbreak of the internecine Imperial conflict known as the Badab War, Vyaniah was still a heavily industrialised Frontier World and was only in the early stages of being developed into a minor Hive World. Vyaniah became the site for a major battle of the Badab War in 906.M41 between the Badab Sector's human Auxilia troops who were collectively known as the Tyrant's Legion and Loyalist Space Marine forces from the Red Scorpions, Marines Errant and Novamarines Chapters. This battle represented the Tyrant's Legion's first deployment for a major campaign against Astartes forces.