God of War has numerous Valkyries that Kratos and Atreus can battle alongside the main questline, and they're some of the toughest boss battles in the game, despite being side objectives. Kratos must utilize a mix of the Leviathan Axe and Blades of Chaos to defeat them. Battling Valkyries won't be available at the start of the game, however, so players must progress well into the story before gaining access to the creatures' lairs and other realms.
Valkyries have an important role in Norse mythology, and they took on a similar angle in God of War. They are angelic figures that bring defeated heroes to the afterlife, either Valhalla (Odin's realm) or Folkvangr (Freya's realm). In God of War, however, Odin has corrupted them for his own diabolical plan, which renders them unable to fulfill their original purpose. As a result, Helheim becomes overcrowded and causes many issues of instability between the Nine Realms. While this never happens in the actual Norse mythology stories, God of War puts an interesting spin on it all, making it a worthwhile adventure for Kratos and Atreus to free them of their corruption.
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There are a total of nine Valkyries in God of War. Freeing them is as simple as showing up and defeating them, but there's a lot more to it than just that; Kratos and Atreus need a magical item, and additionally, two sets of Chipher Pieces that unlock realms where some of Valkyries are located. Without these crucial parts, the Valkyries can't be accessed or set free.
Gunnr, Geirdriful, Eir, Kara, Rota, and Olrun are the names of the first six Valkyries, and they're located in unlockable hidden chambers across God of War's Midgard set up by the Allfather
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