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Mordian is a tidally locked planet; the time of the planet's rotation equal to the time of its revolution around its sun. Consequently, half of the planet is in perpetual darkness while the other is constantly burned by the harsh sun. All life is on its dark side. For good reason, Mordian is also known as the World of Eternal Night.
Mordian's hundreds of millions of inhabitants live on a land surface barely one tenth the size of Earth. Its hive cities are characterized by pyramidal, multi-levelled towers rising like mountains towards space. The government is known as the Tetrarchy, and strictly controls and rations the planet's meager resources. Mordian naturally breeds discontent, and the Iron Guard is the only thing that stands between order and total anarchy.
The greatest threat faced by Mordian came as a result of a conspiracy among Chaos cultists. Summoned by a spell, ships from the Eye of Terror poured Chaos Marines from the skies and daemons appeared within the streets. In the resulting Battle of Mordian, the Mordian Iron Guard eventually emerged victorious against the invasion.
Following the resurrection of Roboute Guilliman and the formation of the Great Rift, Mordian was one of the worlds which became stranded in the Dark Imperium. Mordian was subsequently besieged by the Thousand Sons during the Invasion of the Stygius Sector and though the Imperium's Stygius Crusade later broke the siege, it proved to be no match for Tzeentch's invading forces. The overwhelmed Crusade, was soon forced to retreat from the Stygius Sector. However it is known that thanks to the efforts of the Iron Hands and their Successor Chapters Mordian continues to be held against Chaos forces.
- 1: Codex: Imperial Guard (5th Edition): pg. 16
- 2: White Dwarf 184 (UK), Mordian Iron Guard, by Rick Priestley
- 3: Warhammer Community
- 4: Warhammer 40,000 8th Edition Rulebook, pgs. 164–165 — War Zone: Stygius
- 5: Codex Supplement: Iron Hands (8th Edition), pgs. 32-33