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See how to head to the Great Hall of Truths and complete its puzzles in this guide! The Great Hall of Truths is an underground ruin in Hypostyle Desert, Sumeru for Genshin Impact.
List of Contents
The Great Hall of Truths is located in an underground area, beneath the Hypostyle Desert, that can only be accessed through the Dune of Magma.
Solving the puzzles inside the Dune of Magma and reaching the Great Hall of Truths itself requires enough Clearance in your Scarlet Sand Slate.
The Dune of Magma Puzzle Guide
| Duat Hall Location Walkthrough | |
|---|---|
| 1 |  Upon entering Dune of Magma, proceed to the left or right path by interacting the book device. This should open the door. You'll have to use the air current from the Giant Fan Blades if you did go the left path. |
| 2 | Carefully time the release of the Primal Ember. The Giant Fan Blades should have just stopped spinning before you release it or else the Ember will break from the wind! |
| 3 |  Guide the Primal Ember until it reaches to the main room. The door opens afterwards. |
| 4 |  Head inside the door and drop down the hole. You can carry the Forged Primal Lights with you to solve the Remarkable Chest puzzle below! |
| 5 |  Past the Remarkable Chest puzzle, drop down to another hole which leads you to an underground cavern. |
| 6 |  Proceed deep in the cavern while following the quest marker. |
| 7 |  Once you've reached the big area with an inactivated teleport waypoint underneath, you'll find the entrance of Duat Hall on the upper side of slope. |
| 8 |  Enter Duat Hall. There should be a seelie on the other side of the room. |
| 9 |  Follow the seelie until it guides you upstairs. There should also be another Teleport Waypoint there. Open the door through the Plinth to reach Duat Hall. |
| 10 |  Cross the abyss using the Four-Leaf Sigils and enter the next large room to reach the Great Hall of Truths. |
The Great Hall of Truths is unlocked by following the Old Notes and New Friends' Dual Evidence world quest. The Great Hall is just next to Duat Hall, or the "Place of Swallowing".
Through this world quest, you will obtain the max clearance (Lv4) that can activate all associated mechanisms across the desert area.
Dual Evidence Puzzles and Quest Guide
After obtaining the fourth clearance during the Dual Evidence quest, you will have to activate the giant device at the center of the Great Hall of Truths to continue.
| How to Activate the Giant Device | |
|---|---|
| 1 |  Approach the giant device to unlock the plinths. |
| 2 |  Operate the plinths on the four corners of the room. These plinths require Lv4 clearance. |
| 3 |  After activating, return to the giant device and pass through it to continue the quest. |
| 4 |  You will arrive at the hidden compartment of the mausoleum (the inverted pyramid) after passing through the gate. Release the Primal Embers from the small torches on the other three sides of the room. |
| 5 |  Two Primal Constructs will appear each time an ember reaches another small Primal Torch. Guide the embers towards the large Primal Torches at the center to reach the top of the mausoleum and progress the quest. |
Behind the giant device in the main hall area is a Precious Chest that is locked by two large Primal Torches.
| How to Unlock the Precious Chest | |
|---|---|
| 1 |  Drop down the ledge in front of the Precious Chest to find a Primal Cell. Interact with the cell and follow it to the west side of the giant device, where it will spawn a Primal Ember. |
| 2 |  Follow the Primal Ember to the upper level where it will move to a small Primal Torch. Release the ember and guide it to the large Primal Torch beside the Precious Chest. |
| 3 |  Go back to the moving Primal Cell and transfer it to the other side of the room where it will spawn a second Primal Ember. Guide the ember to the upper level and to the large Primal Torch to unlock the Precious Chest! |
Great Hall of Truths Location and Puzzle Guide
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