This page offers a guide on where to locate and how to complete Cosingtun, which is a Mystery located in Ledecestrescire, Assassin’s Creed Valhalla.
Align the Symbol
This mystery is found south of Repton. The area is swarming with enemies, so before you can align the symbol on the rocks, you’ll need to defeat all of the enemies. When you’ve done so, interact with the black symbol on the rock to begin the mystery. Then, use Odin’s Sight to reveal the hidden symbol on the larger stones. You’ll want to stand towards the rocks, facing east. You’ll want to stand on the slight mound behind the campfire at the center of the rocks. Then, adjust your positioning until the symbol begins to glow and then you’ll have completed the mystery and you’ll earn +1 Skill Point.