At the south of Fuao Vale, you'll encounter a familiar Unique Rock Pillar used to unlock The Lost Valley Domain. It's also connected to a second hidden puzzle that will reward you with a Precious Chest after completion.
Start by heading to the area circled in the image below. Make sure to bring a character who can deal Geo Damage and create Geo Constructs, such as the Geo Traveler, Ningguang, and Zhongli.
Once you get there, you'll find a Unique Rock Pillar and a tree with pink leaves beside it. You need to do the following in the exact order:
- Place a Geo Construct in front of the tree. Its ideal position is circled below.
- Attack the Unique Rock Pillar on the left using Geo Damage.
Related: How to solve Old Chou’s treasure digging game in Genshin Impact
Doing the steps above will prompt Geo Resonance to emit from the Unique Rock Pillar, connecting with the Geo Construct. It will then cause another shockwave to push upward, breaking rocks blocking the entrance to an underground cave.
Reference the area circled in the image above if you're having trouble finding the cave. After, jump down to claim your Precious Chest. If you find that the rocks blocking the cave have not been destroyed, redo the puzzle from the beginning, but try adjusting the position of your Geo Construct.
Check out our guide on How to unlock The Lost Valley Domain in The Chasm — Genshin Impact if you haven't completed the other puzzle featuring the same Unique Rock Pillar.
Nicki is a freelance writer with 5 years of writing experience. She's a fan of anything from HoYoverse, from Genshin Impact to Tears of Themis and Honkai: Star Rail. She also loves rhythm games like BanG Dream! and D4DJ.