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Omon
From Warhammer 40k - Lexicanum
Omon is an oceanic city on the world Jhanna. It rebelled against the Imperium under the oppression of Chaos Space Marines and other renegades and was recaptured by two companies of Ultramarines during the Purgation of Jhanna. These companies were led by Marneus Calgar in 807.M41.[1]