If you have spent some time roaming around the Desert Ruin in God of War Ragnarok, you will have come across the Nornir chest sitting next to a ruined structure. If you spend some time, you can quite easily find two of the braziers needed to unlock the chest but the third one is quite tricky.
The first two can be round on the rocks surrounding the tower that the Nornir chest is next to. Light these and make sure to clear the three red vine things around the back of the structure if you have not done so already.
To find the third brazier, look to the top of the tower while standing out the front. You will see an explosive jar on the top of the structure that you can detonate using your axe. This will light the final brazier and unlock the chest.
If you are unsure what to do, check out the video guide below.