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|Segmentum=[[Ultima Segmentum]]{{Fn|5}}|Sector=Unknown[[Ultima Sector]]{{Fn|5}}|Subsector=[[Ultramar]]{{Fn|5}}

Iax was an [[Agri World]] whose climate and fertility has made it one of the most productive worlds in the [[Imperium]]. There were no large cities on Iax, its land given over to producing quality food. The oldest and most urbanised area is the ancient fortress city of First Landing, its tall citadel withstanding the barrages of invaders over the centuries.{{Fn|1}}

During the [[Plague Wars]], Iax became the site of major fighting. A group of [[Imperial Guard]] refugees brought to Iax were revealed to be unwitting Daemonic vessels, transforming them into [[Plaguebearers]] who managed to summon a cohort of [[Great Unclean One]]s under [[Ku'gath]]. The Daemons summoned vast armies which ravaged the planet.{{Fn|4}} Later, [[Roboute Guilliman]] and [[Mortarion]] engaged in a fateful duel on the planet. The [[Death Guard]] eventually escaped under cover of a [[Virus Bomb]].{{Fn|2}} It is now - a [[Death World]].{{Fn|3}}

== Notable Scions ==

*{{Endn|4}}: [[Dark Imperium: Plague War (Novel)]]{{Cite this}}*{{Endn|5}}: [[Codex: Space Marines (8th Edition)]], pg. 25