Gloom Slough Resources A material used for cooking.

Gloom Slough is commonly found among the ruins of villages or cities, and is named for the glowing light that resembles a candle flame without the heat. Gloom Cicada's diet is mainly fluorescent plants, and the sloughs they produce are left with the sedimented fluorescent matters from the insects' skin.
Sources
Overworld Collection
Jinzhou
Dim Forest