Raider Keep is an optional region in Midgard. It was introduced in God of War: Ragnarök.
It is located in the southern area of the Lake of Nine.
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While there are no collectibles in Raider Keep, you will need to clear out this camp as part of the favor "Animal Instincts." This camp has a blood trail at its entrance, so it's easy to identify.
Defeating all raiders will lead to a boss fight with chieftain Oluf Nautson.