Leave the realm travel room and head to the mystic gate in front of the dwarven shop in Tyr’s Temple. Once inside the World tree, head towards the precipice or edge where you were advised to jump off to earlier. Jump off until you land on the world tree branch that connects to the hidden Jotunheim Tower.
Head inside the tower and place the Unity Stone on the pedestal. This will activate the tower and the gauntlet of the realms challenge. The tower will be connected to various realms and the doors will open to welcome in various types of enemies. You have to defeat all of them in order to proceed to the next realm. The first wave of soft enemies in Niflheim are easily dealt with devastating combos from your blades. Once all enemies are defeated, the doors will close and connect to a different realm.
The door opens when the tower is connected to Alfheim. Dark elves warriors will be your opponents for this challenge. You should already know their attacks and how to deal with them at this point. If not, just anticipate their ranged stun attacks and unblockable spear charge attacks. Counterattacking them after the latter move is the best way to deal damage. After defeating them, make sure to loot the healthstones and other drops they leave behind before the next wave arrives.
The following realm will connect you back to Hel. Equip your blades to deal with them. Hel-vikens, reavers, and guards will attack. Take out the softer targets first like the reavers and guards then save the tougher vikens for last.
The next realm is Muspelheim where you’ll have to face a fierce ogre and a troll named Daudi Munr. Concentrate on stunning the troll first so you can mount it and have it deal damage to the troll at the same time.
Once the troll was taken care of, switch to your axe to attack the troll. Its attack patterns are very similar to the fire troll you fought in Wildwoods and Veithurgard. Evade its attacks and counterattack with runic attacks, especially to its head. Even Atreus arrows can deal significant damage to it so keep shooting whenever you can.
After the battle, loot the drops they’ll leave behind, including the Wrath of Artemis light runic attack. This should be the last challenge. Open the large door ahead to find yourself back in Midgard. This chapter will now be complete.