###Return to Tyr’s Temple
Back on land, you and your companion should board the boat and head back in the direction from which you came before mooring once more close to Sindri’s establishment.
Jump up onto the ledge, but instead of turning right through the arch immediately afterward, continue straight ahead. This will lead you to a unique purple chest that contains another Muspelheim Cipher Piece necessary for the side quest The Realm of Fire.
Return to Midheim on your Realm Travels.
Now, return all the way across the bridge, enter Tyr’s Temple again, and make your way into the realm travel room. Choose Midgard, and you’ll be well on your way to finishing up!
###Return to the Mountain and Go Back Through the Tower
This one appears to be easy enough, but as you exit onto Tyr’s Bridge back in Midgard, you’ll notice a few more foes waiting for you at the far end. These are new, more agile Draugr, so make sure you aren’t caught off guard. Aside from that, the journey there shouldn’t present too much of a challenge.
It is important to note, however, that the Lore Marker that you find halfway through the tower can now be activated. To do so, drop down and turn to your right to find a blue Crystal that has fallen to the ground; pick it up and carry it over to the socket next to the Lore Marker, and then have Atreus shoot it and read the tablet to record the lore.
After that, ascend the wooden rack as you normally would and leave through Sindri’s shop as usual. While you’re there, you can also check in to buy, sell, or improve anything you like. As you progress further into the game, it becomes increasingly important that you maintain the same level of gear throughout.
Wolves are some additional foes that you will encounter here, and you will need to eliminate them, but doing so should not be too difficult. When you are finished, head back up towards the summit of the mountain by resuming your journey on the chairlift.
You will need to walk back up to the section of the bridge that is blocked by the Black Breath, and once you reach that section, you will need to follow the button prompts to remove the Black Breath using your Bifrost. Continue to make your way upward through the thick black smoke until you reach the top and the haze has sufficiently dissipated for you to continue.
You are going to have to do a little bit of climbing here, as this mission comes to an end and the next one starts, and there is some more black smoke just above, but in a short amount of time, you will be inside and prepared for the next stage of The Journey.