|Map||Basic Data||Planetary Image|
At some point, the planet came under attack by the Chaos Space Marines of the Iron Warriors Traitor Legion. Several armoured divisions of the Iron Warriors were committed to the invasion, along with the corrupted Warlord Battle Titan Ecce Bellum. The Tophet System was under an oath of protection by the Subjugators Space Marine Chapter, so a force of 10 Subjugators was delivered to Tophet VI by the Frigate Asuncion to repel the traitors. Supporting the Subjugators in the defence of the principal Hive were Skitarii from Agripinaa and a Warhound Scout Titan maniple of the Legio Debellator. During the fighting on the planet, 4 of the Subjugators were killed and several of the Loyalist Titans were damaged, but the Iron Warriors were pushed back and the Ecce Bellum was destroyed. The remaining Iron Warriors, along with their Dark Mechanicum allies, were routed.