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From Warhammer 40k - Lexicanum
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After the destruction of Istvaan III and the conquest of the other planets of the system, [[Horus]] choose '''Istvaan V ''' as is command post for the conflict to come. With the help of the traitor [[Space Marines]] and [[Titan Legion]]s he fortified the major city of Istvaan V.
When the [[Emperor]] finally ordered seven Legions of the Adeptus Astartes to destroy Horus and his rebels his former Warmaster was ready for them to come.