All known locations on the map Midgard
You will come across it while traversing the illusory locations on the way to the Well of Urd. Drops: Jewel of Yggdrasil, Chaos Flame, 25x Shattered Rune, 25x Bonded Leather, 3x Stonewood, 3x Dwarven Steel, 3x Honed Metal.
It will show up when you destroy the ice blocking access to the legendary chest. Drops: Jotunheim's Endurance (Amulet Enchantment), 40x Shattered Rune (Unique Resource), 1x Luninous Alloy, 1x Asgardian Ingot, 1x Petrified Bone, 25x Bonded Leather.
Drops: Token of Elemental Evasion (Amulet Enchantment), Crackle of Bilskirnir (Unique Resource), 30x Whispering Slab.
Drops: Jotunheim's Honour (Amulet Enchantment), 10x Bonded Leather.
All known locations on the map Svartalfheim
Mini-boss. Drops: Flames of Anguish (Blades Light Runic Attack), Chaos Flame, Dragon Tooth (Unique Resource).
In the same room where you found Tyr. You will have to fight him when you return here later. Drops: Hind of the Four Winds (Draupnir Spear Handle), 10x Bonded Leather, 496 Hacksilver.
Drops: Emblem of Elusion (Amulet Enchantment), Svefnthorn (Unique Resource).
All known locations on the map Alfheim
Mini-boss. You will face her on the way back from the top of the temple. Drops: Frozen Flame (Leviathan Axe Upgrade), Rönd of Expedition (Shield Attachment).
Drops: Alfheim's Honour (Amulet Enchantment), 35x Shattered Rune, 3x Dwarven Steel, 25x Bonded Leather, 3x Stonewood, 3x Honed Metal.
Drops: Alfheim's Fortune (Amulet Enchantment), Dragon Claw (Resources), Skirnir's Gambanteinn (Resource), 2x Dragon Tooth. Killing this beast is the objective of "The Desert Door" mission.
You will be attacked by her when you try to leave the shrine after taking the "Consul's Journal" artifact.
All known locations on the map Jötunheim
Boss fight during "The Lost Sanctuary" main quest.
All known locations on the map Vanaheim
You can come across him here during the main mission "Creatures of Prophecy". Drops: Boon of Valour (Amulet Enchantment), Nar's Cup (Resource).
Drops: Regenerating Essence (Amulet Enchantment), 2x Dragon Tooth (Unique Resource), 1x Dragon Claw (Unique Resource).
Drops: 4x Dragon Tooth (Unique Resource).
Drops: 8x Dragon Tooth (Unique Resource).
You will be attacked by them here when you return to the camp in the mission "Creatures of Prophecy". Drops: Artillery of the Ancients (Draupnir Spear Heavy Runic Attack), Chaos Flame, 8x Dragon Tooth (Unique Resource).
Drops: Seal of the Falling Star (Amulet Enchantment), 8x Dragon Tooth (Unique Resource). You will be attacked by them at the end of the favor "Freya's Missing Peace" when you attempt to get on the boat.
Drops: The Path of Lies (Scroll), 1x Folkvangr Whetstone, 5x Bonded Leather.
Drops: Glaive of Dodher (Relic), 10x Bonded Leather.
Drops: Hunter's Brand (Resource), Gale Flame, 75x Shattered Rune (Unique Resource), 60x Bonded Leather, 10x Purified Crystalline.
Drops: Chaos Flame, 25x Shattered Rune (Unique Resource), 5x Bonded Leather.
Drops: Hilt of Hofud (Relic), Emblem of the Nine Realms (Amulet Enchantment), 3x Beast Bone. It will be a battle against two opponents, one after the other.
Drops: Hind of Deadly Vitality (Draupnir Spear Handle), The Destination (Scroll), 5x Bonded Leather, 75x Whispering Slab.
Story-related boss fight. Unlocks the amulet - Amulet of Yggdrasil (2/9 slots). Drops: Frozen Flame.
This is the dragon you must kill to complete the "Path of Destruction" favor. Drops: Greater Regenerating Essence (Amulet Enchantment), 1x Dragon Claw (Unique Resource), 2x Dragon Tooth (Unique Resource), 15x Purified Crystalline.
Drops: Eri's Armament (Amulet Enchantment), Hunter's Brand (Resource), 100x Shattere Rune (Unique Resource), 10x Purified Crystalline, 5x Bonded Leather, 3x Beast Bone, 504 Hacksilver.
Drops: Seal of Runic Storm (Amulet Enchantment), 2x Dragon Claw (Unique Resource), 20x Purified Crystalline, 40x Bonded Leather. You will be able to get here only after the water in the rivers is restored, so you must first complete the favor "Return of the River".
This is the dragon you must kill to complete the "Trail of the Dead" favor. Drops: Sigil of Doom (Amulet Enchantment), 2x Dragon Claw (Unique Resource), 20x Purified Crystalline, 40x Bonded Leather.
Drops: Vanaheim's Fortitude (Amulet Enchantment), Frozen Flame, 2x Dragon Claw (Unique Resource), 20x Purified Crystalline, 40x Bonded Leather.
You will be attacked by him here but after a short fight he will flee.
You will be attacked by him here but after a short fight he will flee.
Third Location. You will be attacked by him here but after a short fight he will flee.
Drops: Hilt of Hrotti (Relic), The Blind Guest (Scroll), 5x Bonded Leather, 166 Hacksilver.
All known locations on the map Helheim
This is where you fight Garm for the first time.
It is here where you will fight your second "full-scale" battle against Garm.
All known locations on the map Muspelheim
You will fight this battle on your second visit to this realm. Drops: Vindsvalr's Windstorm (Draupnir Spear Heavy Runic Attack), Frozen Flame, 40x Shattered Rune, 1x Petrified Bone, 1x Luminous Alloy, 25x Bonded Leather, 1x Asgardian Ingot.
Drops: Gale Flame.
Drops: Boon of Fury (Amulet Enchantment), Chaos Flame, 25x Shattered Rune, 5x Bonded Leather, 507 Hacksilver.
All known locations on the map Niflheim
You will fight this battle when you find all of Odin's Ravens and open the last of the chests containing rewards for killing them. Drops: Nilfheim's Justice (Amulet Enchantment), Hilt of Forsbrandr (Relic), 100763 Hacksilver.