The Amakagame are essentially just huge stomachs. Their bodies are covered in veins which they use to attach themselves to the cave walls. Rather than actively hunting for their prey, their poisonous stomach acids smell strongly of Baracocha fruit, the Neritantan's favorite food.
The smell wafts through a hole in the top of their bodies and draws prey near before swallowing them whole. They have beady eyes and a puckered mouth, though it isn't clear what their mouths are used for considering they do not eat with them. Their skins are very thin; Riko tore through one easily with a small dagger when she accidentally fell into one.
It also uses pheromones to lure the Neritantan and exists in a symbiotic relationship with them by excreting waste viva its root-like feelers, which produces numerous fruits sprouting around it, and creating a robust, symbiotic nest network.
- Their danger classification is unknown, but due to the fact that they are immobile as well as them being fairly easy to recognize when getting close to one, they don't seem to pose a hight threat to Delvers.
- Only in its larval from the Amakagame can move freely before fusing its feeding opening for a mouth with the roots of Baracocha plants.
- While the Amakagame has no direct appearance in the Manga, the creature was shortly mentioned in a sketch of a map documenting the progress of Riko's group.