Assassin's Creed Valhalla doesn't have multiplayer but does lets you make a Viking mercenary to help friends raid (you will then get rewards for use of your mercenary) : r/XboxSeriesX
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Assassin's Creed Unity Encourages Replaying Co-op Missions, Working Together
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Assassin's Creed Tutorial: How to play COOP? - YouTube
So I tried playing ASSASSIN'S CREED UNITY In 2023... - YouTube