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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; the other 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 meagre resources. Mordian naturally breeds discontent, and the 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.