Pellucida IX is a Mining World in the Drusus Marches of the Calixis Sector. It is the site of the first appearance of the pyromaniac known as the Burning Princess. A novitiate of the Orders Hospitaller executed a cult leader, Silas Grimm, while he was in bed. This occurred during the Mining Riots and served as a staunch reminder that heretics have no place in the leadership of good men. His taint forced the Inquisition to purge one-third of a division of troops and burn down the barracks in which they lived. The remaining troops then served with distinction in quelling the riots following the purge.