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The Warhammer 40,000 universe is set in the 41st millennium, a dystopian and violent future, with the tagline of the game being "In the grim darkness of the far future there is only war." The tagline gave a name to a subgenre of speculative fiction, known as " grimdark." The background and playing rules of the game's factions are covered in the game's rulebooks and supplemental army "codexes," along with articles in the Games Workshop magazines, White Dwarf and Imperial Armour. As of 2021, the game is in its ninth edition, which was released in July 2020. Warhammer 40,000 receives regular expansions, which provide rules for urban skirmishes, planetary siege and large-scale combat.
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The game was created by Rick Priestley and Andy Chambers in 1987 as the futuristic companion to Warhammer Fantasy Battle, sharing many game mechanics with it.
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