The elongated bauplan of the hamerias is greatly suited to navigating the cramp spaces of their habitat, aided further by muscular digited fins. The many barbles on their snouts bear many taste receptors, and coupled with an acute sense of smell, are able to locate prey in the murkiest depths. Sharp bladed teeth would make short work of most prey, but their greatest asset is electrogenesis.

An overwhelming majority of their bodies are made that of their tail, with a sizeable portion of the musculature having been converted into electrical organs. It is with these organs that they are able to punch well above their bodyweight, subduing prey that their jaws alone cannot kill, and repelling great leviathanosaurs like the daemons from predating them.

The largest of the hamerias, the allunian greater hameria rivals many of its contemporary predators, both sexes being around 80 feet long from snout to tail.

Size aside, they are noteworthy in being the best parents of their genus. A curiously monogamous species, both male and females guard their brood of three thousand eggs with their lives, viciously driving away any animal they register as a threat to their young. And while all other species stop their guardianship after the eggs have hatched, the allunian greater hamerias extend their protection up to several weeks after. In this time, the larvae would have undergone a brief but incredibly fast growth spurt, increasing in size ten fold from when they hatched.

While other hamerias hedge their bets on numbers alone, and rely on this rapid and intense growth for survival, the allunian greater hamerias doubled down on their parental behavior as to ensure more young make it pass this volatile period of their lives and thus have better chances overall.