Tranquility System

The Tranquility System is an Endymion Cluster gravity well in the Maelstrom Zone that served as a recruiting ground for the Mantis Warriors. It is not a place of peaceful retreat, despite its name. Tranquility II is a feudal desert world, and Tranquility III is a death world known for the Valley of the Nine Winds. Tranquility I also lies within the system.

The Carcharodons attacked the system during the Tranquility Campaign of the Badab War. They removed a generation of young recruits from the system, and the Mantis Warriors were left without a training ground. The available accounts record no convent world and no T’au sept within the system.

The Tranquility System remains notable as the cluster from which the Carcharodons took the Mantis Warriors’ recruits. Its Ultima Segmentum parentage is retained in unofficial summaries, and it is not to be confused with a Sisters shrine of similar name.