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|Affiliation=UnknownIndependent

'''Exyrion''' was once a [[Hive World]], and the site of a [[Battle of Exyrion|battle]] between the [[Dark Angels]] and [[Iron Warriors]] during the [[Horus Heresy]]. At the end of the battle, almost all life on Exyrion was wiped out when the Iron Warriors activated a weapon of such cataclysmic power that it ended a million lives in a single stroke, the resultant psychic howl causing a warp-storm to tear across the Calaphrax Cluster and cutting it off from the Imperium for ten millennia. A few survivors remained in the extensive underground warrens of the [[Hive]]s, drawing power from the reactor of a fallen [[Warlord Class Titan]].{{fn|21b}}

When the Dark Angels returned in [[M41]], they found the surface infested with [[daemon]]s.{{fn|11a}} Clearing a passage into the underground regions, they encountered a colony of survivors that had endured ten millennia in isolation. The [[Chaos Lord]] [[Korus]] launched a giant missile an asteroid at the planet's surface to crack open the hive and uncover its secrets.{{fn|21b}} The Dark Angels and Iron Warriors both landed their forces, replaying the battle from the Horus Heresy in the [[Second Battle of Exyrion]].{{fn|1c}}

Exyrion is orbited by two moons{{fn|11a}} and an orbital observation platform.{{Fn|21b}}

*{{Endn|1}}: [[Will of Iron(Comic Series)]] **{{Endn|1a}}: Issue #1**{{Endn|1b}}: Issue #2**{{Endn|1c}}: [[Will of Iron]] Issue #23