Assassin's Creed Valhalla: Forgotten Saga

Baldr, the Norse god of light and purity, has fallen into Niflheim — the misty realm of the dead. Odin, consumed by grief and refusing to accept his son's fate, defies the natural order and descends into the underworld to find him. The living are not welcome in Niflheim. The lands are harsh: ice-covered Kaldstad, the poisonous swamps of Nidheim, and beyond them, Hel's Castle itself. Hel's minions patrol every region with orders to destroy any intruder. Getting to Baldr will require pushing through all of it.