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Barbarus was the homeworld of the Death Guard prior to the Horus Heresy. It was the planet on which Mortarion landed and was of such a poor atmospheric quality that even Mortarion could not breathe at the top of its mountains.[2]

Map Basic Data Planetary Image
px Name: Barbarus Barbarus.jpg
Segmentum: Segmentum Tempestus[3]
Sector: Unknown
Subsector: Unknown
System: Unknown
Population: Unknown
Affiliation: N/A
Class: Destroyed[1], former Feral World[2]
Tithe Grade: Unknown


Barbarus was a Feral World which orbited near its dim yellow sun. The atmosphere was thick with virulent gases and a constant fog was spread across the planet. This made it a very dark, dismal place of night with short, shadowy days. Only below the fog could humans survive, in the valleys and low plains.[Needs Citation]

Beings immune to the toxic fog survived within the toxic cloud and built great grey keeps in the mountains. The higher beings began to use the humans as slaves and spread terror among them, what these creatures were is not certain. After landing on the world, Mortarion eventually led the citizens of Barbarus in a revolt against the mountain ruler, toppling them before joining with the Emperor.[Needs Citation]

After the Horus Heresy and the commencement of the Great Scouring, the loyalists subjected all worlds associated with the Traitor Legion's to Exterminatus. Barbarus was among the worlds destroyed by the vengeful Imperium with Virus Bombs.[4]

On the surface of Barbarus was the Wall of Memory, where the names of every Space Marine of the Death Guard legion killed during the Great Crusade were carved.[2]

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