Forgot password
Enter the email address you used when you joined and we'll send you instructions to reset your password.
If you used Apple or Google to create your account, this process will create a password for your existing account.
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Reset password instructions sent. If you have an account with us, you will receive an email within a few minutes.
Something went wrong. Try again or contact support if the problem persists.
Screenshot by Pro Game Guides

How to set lamp frequency and operate the Mountainator — The Heavenly Stone’s Debris World Quest in Genshin Impact

Watch the light flicker.

The Heavenly Stone's Debris is the fourth part of The Chasm Delvers World Questline. Part of the quest involves releasing the safety on the cannon's breach, which involves setting three lamp frequencies and operating a giant cannon called the Mountainator.

Recommended Videos

Make sure that you have read the Safe Blasting Device Signaling Guide, which will tell you that the higher the lamp, the lower the frequency should be. The three lamps are located in the areas marked up in the image below.

Screenshot by Pro Game Guides

How to Set Lamp Post Frequencies

You need to activate the lamps by interacting with them for the first time. After, you can change the frequency of the flicker by interacting with them until you achieve the desired level of frequency.

You can follow the steps below to get the exact frequencies for each lamp, assuming that you haven't touched the puzzle at all. But if you already tampered with them, simply watch the speed of the flicker to gauge the frequency level.

  • First lamp (high lamp post): Low-frequency flicker. Interact with it once to activate, and it will automatically set to the correct frequency level.
  • Second lamp (middle lamp post): Low-frequency flicker. Interact with it twice to activate and adjust the frequency level.
  • Third lamp (low lamp post): High-frequency flicker. Interact with it twice to activate and adjust the frequency level.

Related: Where to find the two keys to the gunpowder storehouse — The Heavenly Stone’s Debris World Quest in Genshin Impact

How to Operate the Mountaineer

Screenshot by Pro Game Guides

After the lamp posts have been set, follow the quest marker to the Mountaineer. You need to blast off a large boulder by correctly positioning the cannon. To do so, align the cannon until it's facing the direction of the boulder, then make it face down as the cannonball naturally fires higher than the angle of the cannon.

If you haven't touched the cannon at all, move it left once and down twice. Otherwise, you can keep trying until you get it right.

Check out our guide on How to unlock The Lost Valley Domain in The Chasm — Genshin Impact to farm local Artifacts.


Pro Game Guides is supported by our audience. When you purchase through links on our site, we may earn a small affiliate commission. Learn more about our Affiliate Policy
We have upgraded our commenting platform! Existing comments will be imported over the next few weeks.
Author
Image of Nicki Si
Nicki Si
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.