Deathwatch

The Deathwatch, known also as the "Long Vigil," and the "Long Watch," is a unique Chapter of the Adeptus Astartes comprised solely of Veteran Space Marines that serves the Ordo Xenos of the Imperial Inquisition as its Chamber Militant. They are the warriors of last resort when the Inquisition needs access to firepower greater than that which the Astra Militarum or a team of its own Acolytes or Throne Agents can provide.