You’ll pass this chest during the early part of your game, even before you reach the Lake of Nine. On the top of the ledge to your left, you’ll see the chest containing the Muspelheim Cipher Fragment.
Head right from where you dock your boat and climb up the chain. Once you’ve made it to the Forgotten Caverns, it’s easy to get the cipher. Once they have, you can head northwest of Tyr’s Temple to find the Forgotten Caverns.
You won’t be able to reach this cipher in God of War until you’ve gotten far enough in the story that the waters have receded a second time. When you reach the top of the ledge, you’ll see a chest with another cipher piece inside. Head over to him, and he’ll drop the chain down so Kratos can climb up. Break the boards by throwing your ax through them, and you can send Atreus through to explore.Ītreus will end up on the ledge with the chain on top of it.
Keep going around the giant, and you’ll see a hole in the cliff face covered with boards. You’ll know you’re in the right place when you see the dead giant on the ground. Southeast of Tyr’s Temple you’ll find the Cliffs of the Raven.
