Nordic Myths

I’m looking for a book that has Nordic myths about different monsters like Näcken, Skogsrå etc. which was in a game called Bramble: The Mountain King. I love everything about the game, it’s “known for its dark, horror-infused take on fairy tales, with a tone that shifts from whimsical to genuinely grim.” I don’t want mythic gods like Thor or Loki, I’m looking for the dark stories. Hope someone knows the game and knows good books hehe, thank you!