There are three very unique shield puzzles in the Warden's Vault in "Dragon Age: Shadowkeep". The first shield puzzle is more troublesome. First of all, the first puzzle is on the left side of the room. The one on the side is the first one you see when you go downstairs.
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Each puzzle is completely different from each other, so it can be completed in any order. And by "the first one," we just mean the one on the left side of the room, the first one you see when you come downstairs. Return to the main level and walk out the back of the lobby until you emerge into the castle courtyard. To the right of the exit you will see a flammable bottle sitting next to a wall with a quest marker.
Use Tash's ability (or Rook's knife if Tash isn't here) to blow up the bottle and cause the ladder to fall. Now you can climb up and grab a ghost ball. Once you have it, jump back down and run into the Watcher's Castle again. However, instead of going forward into the warehouse hall, go left.
Here you will see a crack in the wall next to a heavy wooden door. The ghost ball floats in and awakens a skeleton, which pulls a lever to open the door. There's another switch inside, and next to it is a Gray Warden's shield. Flip it and you're a third of the way there.
Also in this room are 11 gold coins, a Memento of the Eternal Wail for the Caregiver, Venadal's Tears, and (for rogues) a Dragon War Bow.
