Finding as many Legendary Chests as you can in God of War Ragnarök is always to your benefit, as they hold unique items. These items generally help you enhance your preferred playstyle or help you compensate when you are required to fight in a way you may not be as comfortable with. Here's where to find the Legendary Chest in The Burrows of Alfheim in God of War Ragnarök.
Where to find the Legendary Chest after freeing the second Hafgufa in God of War Ragnarök
Finding this Legendary Chest will require you to complete the Song of the Sands Favor by finding the cave entrance of the Second Hafgufa and freeing it. After you've cleared the Hive Matter from the Hafgufa, Freya will stand next to an archway. Go through it and down the ledge to find the Legendary Chest. Start approaching it, and you'll be greeted by a Bergsra and a few other smaller minions. You'll need to defeat them before looting the chest.
Inside the chest will be a Heavy Runic Attack for your Blades of Chaos, Nemean Crush. There is also a Tribute to Freyr, a pipe artifact, next to the broken pillar to the left of the Legendary Chest. Look for the purple glow to find it.
While you're in Alfheim, you should think about completing The Elven Sanctum Favor in God of War Ragnarök. Check out How to complete The Elven Sanctum Favor in God of War Ragnarök and How to beat The Maven in The Elven Sanctuam in God of War Ragnarök here at Pro Game Guides.