Terminus Est

The Terminus Est is a capital ship built on the shipyards of Luna and assigned to the Death Guard. It served as the flagship of Calas Typhon and later Typhus; it is not a planet, and no present coordinates are recorded.

While becalmed in the warp, after Typhon had the fleet’s Navigators executed, the Destroyer Plague struck the Legion aboard the ship. Mortarion struck Typhon down, and Ignatius Grulgor strangled him; Typhon revived, and Grulgor’s body dissolved and merged with his own, so that he became Typhus, Herald of Nurgle and host of the Destroyer Hive.

Chaos cultists on Zaramund had already addressed him as Typhus during the Great Crusade, before this transformation aboard the Terminus Est.