With every new Genshin Impact update, we get new characters in the game, and to ascend them, we need to farm their ascension materials. One of them is the Lumitoile which is an ascension material required to ascend characters like Neuvillette, and it will become available in Genshin Impact 4.1 update to farm.
As per its in-game description, it is "A soft-bodied animal that emits a gentle light. Often found climbing the walls of buildings near the water or underwater." Since Fontaine will be expanding with the new update, you will be able to find Lumitoile in the new areas; however, it will be a difficult task to explore a massive region to farm them, and thus, here are their exact locations to save you a lot of time.
Genshin Impact: Lumitoile Farming Location
Lumitoile is a local specialty of the Fontaine and can be found in the Liffey Region near the water or underwater. You can have a look at their locations below:
You will need a total of 168 Lumitoile to ascend Neuvillette to his highest level, and as per the speculations, you can farm 79 of them in a single run. After that, you will have to wait for them to respawn to grab the next batch.
You can travel fast from one location to another by using Teleport Waypoints and the Statue of Seven to collect them quickly. In addition to this, make sure that your HP is enough to fight enemies, as you might encounter some while exploring.