Iron Gate's sprawling Norse adventure has been a part of PC Game Pass for roughly six months since arriving in September 2022 - and it's now a part of the console library from day one.
Here's some more info on Valheim, along with the game's Xbox launch trailer:
Valheim (Xbox Series X|S, Already On PC)
"A brutal exploration and survival game for 1-10 players, set in a procedurally-generated purgatory inspired by viking culture. Battle, build, and conquer your way to a saga worthy of Odin’s patronage!
Explore a world shrouded in mystery. Discover distinct environments with unique enemies to battle, resources to gather and secrets to uncover! Be a viking, sail the open seas in search of lands unknown, and fight bloodthirsty monsters."