Sever the two tendons blocking your path with one throw of your Leviathan Axe, and turn to the right to see a chest that you can open, which will reward you with a Muspelheim Cipher Piece.
To take them out quickly, you’ll want to use Atreus’ arrows to knock them down to the ground whenever they hover in mid air, giving Kratos an opening to finish them off. These are the elves of God of War, and it’s the dark ones that are hunting both Kratos, Atreus, and all the light elves of the region. Head forward and get Atreus to read out the brief lore passage from the runes on your left, and then continue down the path for you first combat encounter with some different enemies.