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Calth
From Warhammer 40k - Lexicanum
Calth is part of Ultramar, the UltramarinesEmpire. It is an airless world where the population live in large cities underground. It is best known for its production capabilities and its orbital shipyards. They are used by the Ultramarines, civil and other military craft for wider use throughout the Imperium.
During the Horus Heresy, Calth was used by Roboute Guilliman as a staging post for his supposed assault on the Veridan System. Horus had ordered the Ultramarines there to divert them from the Siege of Terra. It was then that they were attacked by a force of the Word Bearers legion.
Calth has escaped attacks by both Hive Fleet Behemoth and Kraken.