The Mountain Hel Fire Puzzle. Your ship descends after each pass. Hel wind puzzle the mountain solution.
It requires two runes to open. There s not a lot to these puzzles just stay out of the fire and kill the draugr that pop up as quickly as possible. Scan it by holding r2.
Go up the hill and look at the wooden pillars sticking out of the ground.
Firing on a mountain will only destroy part of it reducing its height. The first rune door. It requires two runes to open. Use whatever cover you can find.