The Crumbling Hall

To deactivate the first and second spirit walls you need to go to the left and right sides of the room and click the little pedestals that have green orbs floating above them.

The final spirit wall is opened by a pedestal directly to the left as you enter the door to the final room.

When entering the Guo-Lai Halls, make note of the symbol at the bottom of the stairs. Many of the rooms in here have stones with various symbols on them and stepping on those with the same symbol will prevent you from taking damage from various sources.

If you're doing this in Remix:

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2. Enter the Guo-Lai Halls (Vale of Eternal Blossoms /way 22.6 27.2 Guo-Lai Halls ).
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4. Go down the ramp. The green circles will speed you up. There are a lot of mobs, and some of the statues will come to life if you get near them, even in stealth, so watch out.
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6. When you enter the first big room, you'll see one floor tile that looks different from the rest. Remember that tile pattern. That tile is safe. All the others will damage/kill you.
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8. From the big room, turn left. You'll enter another room with more mobs, statues, and rubble. You can make your way around the rubble.
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10. Go down the hall, turn right, and go down the stairs into the next room. There will be a misty wall up the stairs to your left, and you'll see another misty wall up the stairs ahead and to the right.
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12. Go right (not ahead and then right) up the stairs. You'll see a Spirit Orb. Kill the mobs and click the orb. This deactivates the misty wall you saw up the stairs to the left (now across the room).
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14. Go across the room and up the stairs. Kill the mobs and click the second Spirit Orb. This deactivates the misty wall that was beyond this room to the right.
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16. Go down the stairs, turn left, go up the stairs, and kill the mobs. Turn right and go down the ramp.
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18. Look at the floor tiles. If you remembered the tile from the very beginning, you should see a clear path that will eventually get you to the far stairs, which are blocked by a final misty wall.
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20. Look for another clear floor tile path to a final Spirit Orb. For me, it was directly to the right. Kill mobs, click orb, stay on the path, and go up the stairs.
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22. Click the quest item. You should also have at least one Guo-Lai Cache Key, so open any chests you can.
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24. Stealth, hearth, or fight your way back along the same path out.
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All the mobs in here do floor things, so keep careful watch. They'll drop runic circles that damage or stun, circular AOE attacks, and shockwaves that stun. Be prepared to move a lot while fighting, but don't step on bad floor tiles.