Genshin Impact 2.6 update has introduced a brand new area called The Chasm, full of dark underground mines. You will have to enter these mines to complete various quests, and it can get quite hard for you to explore the area in the dark.
Hence, HoYoverse has introduced a new gadget called Lumenstone Adjuvant that will provide illumination in the dark for you to see your surroundings in a better way. However, the illumination will last for a certain period of time, and you will have to recharge it again in order to be able to use the gadget again.
In that case, you will have to find Lumenlamps and Lucklights to keep it active, which is not possible all the time. Thus, you can upgrade the Lumenstone Adjuvant using Lumenspar to make the gadget long-lasting and here's where you can find them.
Where to find Lumenspar in Genshin Impact
Lumespar is a blue coloured shiny crystal that you will find floating in The Chasm mines. There are 83 Lumenspar available across the network of underground mines, and here are the locations of all of them as marked by the HoYoverse Genshin Impact interactive map.
After you collect a sufficient amount of Lumenspar, you will need to go to Juwin, the safety technician, at her camp and interact with her to upgrade the Lumenstone Adjuvant.
You will need a different number of Lumenspar in order to upgrade Lumenstone Adjuvant to various levels.
You will get various rewards, including Mora, Primogems, Intertwined Fates, and more, upon upgrading Lumenstone Adjuvant.
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Featured image courtesy of HoYoverse.