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Omen of Sorrow Steam Key: Official PC Key, Instant Delivery

Yes. Every Omen of Sorrow key we sell comes from a distributor authorized by the publisher.
Open Steam, click Games, choose "Activate a Product on Steam", then paste your key. Omen of Sorrow is added to your Steam library right away.
Some keys only work in certain regions. This page shows where this Omen of Sorrow key can be activated before you buy.