A Path To Jötunheim

Exit the hidden library, take the elevator down, and realm travel back to Midgard.

Visit the dwarven brothers to have them craft the key for Týr's door.

Access the shop for new crafting recipes, including powerful Niflheim armor (recommended to save for post-game).

Upgrade the Blades of Chaos to Level IV with the Chaos Flame from Helheim. Note that final upgrades for both Leviathan Axe and Blades of Chaos require post-game content.

Purchase new skills for the Blades of Chaos from the Skills screen.

Accept the 'Hail to the King' favor from the dwarves.

Travel to the Svartalfheim Realm Tower via Mystic Gateway and light the brazier.

Defeat the Traveller.

Ride the elevator down to the boat, head north, then west through the tunnel to King's Hollow. Dock the boat.

Activate the Mystic Gateway and use the entry stone on the pedestal.

Follow the path, burn brambles, and take the chain down.

Read the Lore Marker and find Sindri at his shop. Purchase items if needed.

Continue forward to find the final dragon to free.

Defeat the two Hel-Walkers that spawn, then throw the axe at the Scorn Pole.

Open the coffin, defeat the Hel-Walkers that ambush you, and find the first Raven on the wall behind the coffin.

Head back and take the other path down, defeating Hel-Walkers. Look left to find the next Mystic Gateway.

Continue down the path, defeat another Hel-Walker group, and throw the axe at the Scorn Pole to reach the Stronghold doors.

The door requires three keystones. Pick up the first keystone in front of the door and place it in the pedestal.

Head south to find the next keystone. Follow the path past the Scorn Pole, brambles, and two Wulvers to reach ruins with a Soul Devourer.

Defeat the Soul Devourer by waiting for its core to expose and hitting it with the axe, then throwing its fallen clusters back at it. Dodge its beam attack.

Loot the spoils, burn the brambles, and find a coffin.

Go up the stairs (ignoring the wind trap for now) and shimmy across the wall.

Defeat the Wolves at the end. Look southeast to spot a Light Crystal hanging. Toss the axe at the runic disc to drop it into the stream.

Drop down, pick up the Light Crystal, and carry it along the path through the gate.

Shoot the Light Crystal to create a bridge across the gap above.

Defeat the Wolves, then carry the Light Crystal down the north path. Place it in the pedestal at the end after defeating the Wulver and Wolves.

Shoot the Light Crystal to erect a bridge overhead.

Follow the path back south through the ruins to find the wind trap you ignored earlier.

Grab the Winds of Hel and run up the stairs, across the newly erected bridge, and deposit it in the next wind trap.

Repeat this process one more time, depositing the energy in the door at the end to find two sacks of Hacksilver.

Climb the ledge and look left to find the second Konùnsgard Stronghold Entry Stone.

Kick the shortcut chain down and head back to the door to insert the stone. This will open portals from which Hel-Walkers and Hel-Viken will emerge. Defeat them using Runics and Summons.

Head north. When you reach the waterfall on your west, toss the axe at the wooden boards to lower the water level.

Access the area behind the lowered water, defeat the Hel-Walkers, and open the coffin.

Continue along the path until a Fierce Ogre blocks your way.