God of War: Ragnarok - Muspelheim Collectibles

Muspelheim is part of Atreus' story. You will reach it with him and Thor as you progress the main story, but nothing you get here as Atreus will count towards trophies or overal percentage. Later on you will gain access with Kratos and thats when the fun starts.

When you defeat some enemies during your first visit with Atreus, you will get Falcon's Dive Runic Summon.

To enter Muspelheim with Kratos you will need 2 Muspelheim Seed Half key items, one is in Modvintir's Rig, the other in Alberich Hollow; both in Swartalfheim. Afterwards you can activate Mystic Gateway in Muspelheim when interacting with Mystic Gateway to visit other realms.

The Crucible

Unlocked when using Muspelheim Seed Halfs from any Mystic Gateway. This is the arena area, the only tedious area in the game. There are 15 challenges for you to complete, some even multiple times.

• Nine Realms in Bloom 1/1
  Location: At the start, one ledge down from where you start, on the right side, next to the blacksmith.
• Muspelheim Trial "F" 1/3 Weapon Mastery
  When you enter, you can inspect the sword on the left with letter "F" on it and do the first 2 challenges. Defeating enemies before the time limit is not that hard. You can return here later if you can't do it at the moment. You will get Shoulder Guard of Undying Pyres (Chest Armour).
• Muspelheim Trial "F" 2/3 Flawless
  When you enter, you can inspect the sword on the left with letter "F" on it and do the first 2 challenges. You need to take care of all enemies without getting hit. It can be tricky, but use your swords or long distance attacks while dodging to survive.
• Muspelheim Trial "N" 1/3 Ring Out Challenge
  When you enter, you can inspect the sword in the middle with letter "N" on it and do the first 2 challenges. Hard to 1-hit enemies if you ask me, so make sure to toss them into the lava to insta-kill them. Easy challenge. You will get Bracers of Undying Pyre (Wrist Armour).
• Muspelheim Trial "N" 2/3 Feed the Rift
  When you enter, you can inspect the sword in the middle with letter "N" on it and do the first 2 challenges. Kill enemy, toss the orb the enemy leaves into the rift. Another easy challenge.
• Muspelheim Trial "R" 1/3 Population Control
  Location: When you enter, you can inspect the sword on the right with letter "R" on it and do the first 2 challenges. Kill smaller enemies to keep the number below the target while defeating stronger, elite enemies. You will get Girdle of Undying Pyres (Waist Armour).
• Muspelheim Trial "R" 2/3 King of the Hill
  When you enter, you can inspect the sword on the right with letter "R" on it and do the first 2 challenges. Keep enemies away from the rings.
• Nornir Chests 1/1: Chaos Flame (Weapon Upgrade).
  Location: Beat one challenge on swords with letter "R", "N", and "F" at it will open.
• Muspelheim Trial "F" 3/3 Rampage
  After completing the first 2 challenges on all 3 swords, you unlock the last one on each. For this one you need to defeat 20 enemies before the timer runs out, which is not that hard. You will get Smoldering Embers Resources.
• Muspelheim Trial "N" 3/3 Health Steal
  After completing the first 2 challenges on all 3 swords, you unlock the last one on each. You take constant damage but you heal when inflicting damage as well. Personally the easiest challenge of them all. You will get Blazing Embers Resources.
• Muspelheim Final Trial 1/6 Endurance Challenge
  When you beat any challenge on sword "F" and "N", you can tackle this one on the main sword. You just need to survive, and it's not that hard. After beating 99 enemies you are done. You will get Surtr's Scorched Cuirass (Chest Armour) 
• Muspelheim Trial "R" 3/3 Kill Fuse
  After completing the first 2 challenges on all 3 swords, you unlock the last one on each. When you kill enemies the timer increases. It's rather simple.
• Muspelheim Final Trial 2/6 Boss Rush Challenge
  When you beat any challenge on sword "R" and "N", you can tackle this one on the main sword. It's a boss rush, but not that hard.
• Muspelheim Final Trial 3/6 Onslaught Challenge
  When you beat any challenge on sword "N" and "R", you can tackle this one on the main sword. Just survive until the timer stops.
• Muspelheim Final Trial 4/6 Shield Breaker Challenge
  When you beat any challenge on sword "F" and "R", you can tackle this one on the main sword. Kill smaller enemies first so you can kill the stronger ones.
• Muspelheim Final Trial 5/6 Ring of Fire Challenge
  When you beat any challenge on sword "N" and "F", you can tackle this one on the main sword. Stay withing the ring, otherwise the fire will burn you. Also, freeze the yellow fog totem for an easier time. You will get Muspelheim's Endurance (Amulet Enchantment)
• Muspelheim Final Trial 6/6 Phantom Challenge
  When you beat any challenge on sword "R" and "F", you can tackle this one on the main sword. Defeat all enemies. You will get Muspelheim's Essence (Amulet Enchantment)
• Defend your Valour 1/1
  Location: From the middle where the big sword is, check the hole you can crawl under. Following that road will lead you towards Gna - the strongest opponent in the game, a valkyre. Beating her will unlock The True Queen trophy. You also get The Queen's Armour for Freya, Rond of Obliteration Shield Attachment, and The Queen's Roar Heavy Runic Summon.

Burning Cliffs

You will end up here during story. It's the time when you get here with Kratos that counts towards collecting.

When you defeat Flame Phantom during exploring you will get Vindsvalr's Windstorm Heavy Runic Attack, and Frozen Flame Weapon Upgrade.

• Legendary Chests 1/1: Divine Ashes +1000
  Location: Just follow the path from the entrance and the chest will be in front of you.
• Odin's Ravens 1/1
  Location: Just rigth from the Legendary Chest #1.
• Nornir Chests 1/1: Iđunn Apple
  Location: Following the path further you will see a stone with yellow mark on your right as you descent a path. Destroy it with your spear and you will see this chest. One letter is just across it, and the other 2 are on the side. You will need to be really precise with your purple arrows here. Light the left brazier, then connect left brazier with the right one. Shoot the same spot to boost your purple arrow bubble, it's the only way.
• Remnants of Asgard 1/1
  Location: Across the Nornir chest after clearing the game.
• Lore 1/1: Valhalla Rises
  Location: After clearing Reamnants of Asgard, check the blue letters on the wall in that area, it will not appear before clearing the game.

Surtur's Forge

Area after Burning Cliffs.

By defeating Soul Eater here you will get Chaos Flame Weapon Upgrade.

By defating Hrist & Mist you will get Gale Flame Weapon Upgrade.

• Odin's Ravens 1/1
  Location: Look behing Surtur, directly across where he stands.