In God of War Ragnarok, Into The Fire is the eighth objective in The Path’s main story questline. As Atreus, now trading as Loki, you are sent by Odin to the fiery volcanic realm of Muspelheim. There you need to look for the mask fragment accompanied by Thor. But if you want to achieve 100% completion, you will have to look for a lot more. The first region of Muspelheim you explore is the Burning Cliffs, and if you check the map in your journal, you’ll see that there are five collectibles to be found there: a Nornir Chest, a Legendary Chest, a Lore Item , one of Odin’s ravens and a collectible marked as “Undiscovered” when you first explore the Burning Cliffs. That means you have to complete the Into The Fire quest and later return to Muspelheim to complete the Burning Cliffs. But you must be wondering how much later.
Related: How Muspelheim Final Challenges work in God of War Ragnarok
How to get the undiscovered collectible in the Burning Cliffs of Muspelheim
The undiscovered collectible in the Burning Cliffs region of the Muspelheim realm is a holdover from Asgard, which means you need to fully complete The Path’s main questline in order to start The Last Remnants of Asgard’s Favor side quest. Once you start The Last Remnants of Asgard, groups of Einherjar will appear in the remaining realms, including one in the Burning Cliffs of Muspelheim.
To get the remains of Asgard, explore the Burning Cliffs until you come across a Nornir Chest. Go east to the area opposite the Nornir chest where you will find a Lore (Valhalla Rises) rune reading item and a band of Einherjar. Defeat all of the Einherjar and the remains of Asgard will be checked off on the checklist on the map in your journal.
https://www.gamepur.com/guides/what-is-the-undiscovered-collectible-in-burning-cliffs-in-muspelheim-in-god-of-war-ragnarok What is the undiscovered collectible in Burning Cliffs in Muspelheim in God of War Ragnarok?