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Diamat is a Forge World of the Imperium.

Map Basic Data Planetary Image
px Name: Diamat Unknown.jpg
Segmentum: Ultima Segmentum
Sector: Unknown
Subsector: Unknown
System: Unknown
Population: unknown
Affiliation: Imperium
Class: Forge World
Tithe Grade: Unknown

During the Horus Heresy, Warmaster Horus moved its Titan Legion, the Legio Gladius, to the galactic south to leave it vulnerable for his upcoming rebellion.[1]

When word of the Heresy spread, the Dark Angels under Lion El'Jonson led a small force to the world to secure its powerful siege engines against traitor forces. A brief battle broke out between Dark Angels and Horus' forces and both tried to secure the world, one where the loyalists eventually prevailed.[1]