Storm Jelly

A storm jelly is a type of large, medusae-like aquatic invertebrate that sometimes proves a danger to unprotected swimmers, especially in Western- and Western-adjacent cube layers. Storm jellies can be up to 6' in diameter and weigh almost 200 pounds out of the water.
While superficially similar in shape to other free-swimming members of the phylum cnidaria, storm jellies have a rudimentary intelligence, have electrocytes in addition to venemous cnidocytes, and hunt primarily by stunning their prey with electrical shocks before closing for the attack. Storm jellies are notable for their aggression relative to their more passive medusae counterparts. The creatures are able to distinguish prey through a combination of chemoreception and patches of simple eyespots, stun nearby creatures with shocks, then approach stunned prey with carnivorous intent. The cnidocytes of the storm jelly are venemous enough to injure an adult or kill a child, but do not constitute the only threat presented by the creature to unprotected swimmers.
A storm jelly cannot distinguish humans or Rostran from its regular prey and, as such, will attempt to stun and eat them, too. Aside from actively hunting smaller creatures (including young humanoids), storm jellies are also dangerous in the water because their shocks are strong enough to incapacitate would-be rescuers, causing them to drown even if not entangled and envenomated by the creature's tentacles. This danger is significantly reduced when the creature is beached, but beach-goers can still be envenomated by contact with a specimen that is not yet dried out. For this reason, the Rostran Archipelago Confederacy maritime authorities keep track of storm jelly formations and relay warnings to nearby communities as a matter of public safety.