Enter the bridge and jump into the swamp. Make your way through the sunken house and beyond until you've reached an arch identical to the one seen in Valravna - turn left to continue. Continue moving forward and past a new gate - you'll discover a hidden pathway. Follow the trail to discover a new arch.
Pick up a story rune and continue through the gate. Follow the pathway leading to the previous arch and go past it to unlock access to the tower. Climb it and look to your right - you should notice a fragment of a bridge. Activate your focus and recreate the bridge, then get off the tower and use the bridge to continue your journey.
Enter the building and pick up a story rune, then continue to the runed door. You'll be taken to a burning house where you'll have to escape from the fire and acquire three runes. The task is quite demanding, as the flames are deadly and will quickly take care of our heroine. Begin by turning right and start running forward. Turn left and run to the bright corridor. The wall contains the first rune - pick it up and make your way left.
Continue running forward and slide beneath the wall. Go left, forward, and right. You'll see a light - run towards it. You'll discover a second rune.
Turn around and go right. Turn left at the crossroads, then go right, right, and forward beneath the planks. You'll encounter the third rune. Pick it up while running, turn around and go right, right, left through the door and right at the junction. You'll finally reach the runed door. The sequence will end, leaving you with a new fragment of the sword.