Armageddon

Armageddon is a hive world in Segmentum Solar whose name the Imperium uses as shorthand for industrial war. Angron's First War, Ghazghkull's later Waaaghs, and the Season of Blood have all spent armies here, and the Steel Legion still fights in sealed tanks across the ash wastes. Some later histories claim the planet is Ullanor relocated after the War of the Beast. Whatever its origin, it remains closer to Terra than Cadia and still eats reinforcements. Yarrick’s Steel Legion and Dante’s Blood Angels met Ghazghkull’s Waaaghs across this Armageddon System hive world; Tu’Shan, Grimaldus, and Helbrecht have all bled its ash wastes beside Angron’s earlier First War.