Before we'd even heard of Valheim, there was Tribes of Midgard. It's a co-op Viking survival game for up to 10 players, though it can be played solo as well. Its procedurally generated world is filled creatures based on Norse mythology. You can explore the world, battle monsters, and craft gear, and build a sweet Viking base...
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More co-op Viking action is headed your way in Tribes of Midgard this July
Source: PC Gamer (opens in a new tab)