Legendary Chest Inside The Mountain. Once at the top go to the right and get atreus into the cavity to make him drop the chain. To complete the mountain the following items are needed.
A golden legendary chest can be found in the region the mountain as part of the quest inside the mountain. 28 shop 2 3 20 53 unmissable from story. When the waters of the lake of nine have gone down twice return to the stone falls to find giant.
Fast travel to the summit and then go down and run all the way across the snow bridge to the giant door.
There are 3 legendary chests located on the mountain. Continue through the caves until kratos reaches a large open cavern with a claw that. During inside the mountain. Behind the sap wall to the left of the golden statue inside the mountain is a powered down lore marker.