Parafinned dragons are one of the rarest species of dragons to find as an adult, due to the nature of their biome. Unlike other ocean species, parafinned dragons live where the Edge and the ocean meet, and the few mages who have made the trip to this edge can recall the bright lights that emanate from deep underwater, produced by these dragons. Many seagoing mages will use the sight of these dragons to track how far off course or on course they are, and how alert they should be for possible attack.
This dark, tiny hatchling is completely reliant on water. You rarely see it, although it sometimes gives off a faint glow and you can see it many feet under the water. It has grown colorful splotches on it and often uses these patches to attract prey.
Your small hatchling has grown into a quite large dragon now, and has long, ruffled, luminescent outcroppings of skin on its side where usually a pair of wings would be. It also has these growths on its tail and uses them as a lure to attract fish and also to confuse predators. It is mild mannered and will sometimes surface when you summon it.