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Advex-Mors is a System in the galactic north which is notable for being the location of the first sighting of the Rangdan during the Great Crusade. It was the site of the first major battle of the Rangdan Xenocides, which left it barren and depopulated. Afterwards the First Legion declared the region forbidden to enter but by the end of the Great Crusade still had a small outpost there should the Rangdan ever return.[1]

The outpost was later Attacked by the Sons of Horus during the Horus Heresy[2]


Advex-Mors consisted of eight worlds, two of which are named:[1a]

  • Advex-Mors Extremis - Outermost world
  • Advex-Mors Primus - Capital world