Genshin Impact

Deep Sea Unagi

A slender, amphibious fish that often appears in the deep ocean. Biologically, it is an offshoot of the unagi, and it often acts in symbiosis with larger creatures.
As to why they appear in Enkanomiya, it may be that the Bathysmal Vishaps, rays, or perhaps even the ancient Great Serpent brought them to this strange land.