Noctilucous Jade can be founded in caves,
You can get about 7 Noctilucous Jades here. See the photo below to find the way to the cave.
You can get about 20 Noctilucous Jade by visiting these spots.
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All Liyue Luxurious Chest Locations
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ATK% VS Physical/Elemental DMG% in Genshin