Identifier: Tentacles
Multiply by shedding it's tentacles and wedging each fallen tentacle between underwater rock formations. The tentacle over time grows, and will take around a year or even two to fully form into another Stang. The water current and the rocks mold Stangs to have sharp edges while still having an outward slimy appearance. The slimy sheen on the skin helps it seem less threatening to prey, but tasty to potential predators. When a predator tries to eat a Stang, the Stang releases a neurotoxin from it's skin, which paralyzes the predator and lets the Stang escape to safety.
It's eyeball is just for show and it rolls around 'looking' at anything, and seems to be a mutation conjured up by someone who wanted to see jellyfish with eyes. What a weirdo!