Slimes

Slimes are Monsters of the Hidden Dungeons. They are no more than elliptical clumps of jelly 30 cm in width, but usually their color is turquoise or light green. There are also ones with a red shade, but they're rare in this region. Gold slimes on the other hand barely exited on the entire continent.

Slimes are pretty useful in that they can be eaten after defeating them. Based on the things they ate up to that point their taste changes as well. There are even slime ranches.