There are three very unique shield puzzles in the Warden's Vault in "Dragon Age: Shadowkeep". The third shield puzzle is very troublesome. First of all, the quest mark itself will take you to A raised platform in the hall, but this is the end of the puzzle, not the beginning, so it can be ignored.
How to solve the third puzzle in Dragon Age 4: Warden Vault
The quest marker itself will take you to a dais in the hall, but this is the end of the puzzle, not the beginning, so it can be ignored. If you've already gotten here and dropped the ladder, climb up the ladder and jump off the balcony outside to enter the hidden alcove below it. Here, you'll need to smash the boxes and barrels to reveal three switches.
If the ladder has not been thrown down yet, you need to go to the fast travel beacon at the northern entrance to the Jailer's Castle, and then go through the cave on the right (the second shield is the location of the third spirit). Immediately after the exit, turn left to find a hidden area filled with old crates and barrels. Destroy them well.
You need to get all three fires burning, which means interacting with the switch on the left first, then the switch on the right, and finally the switch in the middle. Once you're done, either go back inside and climb the ladder, or turn left at the exit and go all the way to the end. Here you can climb up a pile of logs to reach the balcony and then go inside. Lower the ladder here and interact with the switches on the wall, which should all light up.
If you toggle switches in the wrong order, you can reset by traveling to another area and back. Progress on shields that have been activated so far will be saved.
The switch on the wall opens the door next to it, leading to a room containing the final shield switch, as well as a room containing Cunning Sharpness +5 (for rogues), Imperial Weaving +5, Fine Silver, and Treasure chest with 83 gold coins. Afterwards, climb the ladder back to the lobby and go downstairs to collect your loot.
