The Lumenstone Adjuvant is a Chasm exploration Gadget that can help Travelers traverse the dark Underground Mines. To obtain it, you must complete the first two parts of The Chasm Delvers questline: The Chasm Charters and Surreptitious Seven-Star Seal Sundering. This will automatically unlock the Chasm Spelunkers World Quest, which will be the key to obtaining the Gadget.

Once you’ve initiated the quest, follow the quest marker to the nearby Lumenspar. Approach it to prompt a dialogue with Jiwu and Zhiqiong.

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The Lumenspar will interact with the Lumenstone Adjuvant in your Inventory, transforming it into a useable Gadget.

How to Use the Lumenstone Adjuvant

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The Lumenspar Adjuvant can be equipped from the Gadgets section of the Inventory. It acts as a portable flashlight, lighting the area around you as The Chasm’s Underground Mines have low visibility. The image above demonstrates the lighting difference with and without the Lumenstone Adjuvant.

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The Lumenstone Adjuvant can also be used to recharge Trial Challenges, Lumenlamps, and Chests to activate them. But keep in mind that doing so will consume Energy, which may cause the Gadget’s luminosity to disappear once exhausted.

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You may also encounter mucky blobs in the Underground Mines. Stay away from them, as they will drain the Lumenstone Adjuvant’s Energy.

How to Recharge the Lumenstone Adjuvant’s Energy

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The Lumenstone Adjuvant’s luminosity is not permanent. There are various instances that could drain its light, so you need to constantly refill its Energy. This can be done through the following:

  • Approaching Lumenlamps.
  • Destroying rocks with a faint blue glow surrounding them.
  • Catching Lucklight Flies.
  • Getting Lumenspars.

How to Upgrade Lumenstone Adjuvant

The Lumenstone Adjuvant can be upgraded using Lumenspar. Collect them and send them to Jiwu in her base, which you can teleport to directly through the World Map.

Upgrading the Lumenstone Adjuvant will grant you various rewards (including a Crown of Insight!) and increase the Gadget’s Energy storing capacity, as well as provide you with extra exploration aid.

Check out our guide on How to unlock and complete A Cliff-Side Hero’s Past World Quest in Genshin Impact to explore more of The Chasm.