Kaiser Sharks

The Kaiser Shark is a genetically mutated hyper-predator that prowls the waters of the South Harbinger Sea. Previously known as the harmless Jester Sharks before their mutation, they were exposed to harsh radioactive chemicals and substances as a result of intensive drilling and deep-sea mining by both the Iron Coalition and the Pax-Viribus Theocracy. While many of them died as a result, a small few of them survived and managed to reproduce, eventually in large numbers. Currently they have reached some sort of tolerance or equilibrium with the pollution, creating a definitive species in the process. 
Measuring in at a staggering 64ft on average, Kaiser Sharks are the absolute apex predators of the sea. There are very few specimens that have been acquired, many of which happened to wash ashore during heavy storms. Their entire body is covered by a thick, slimy green blotchy skin, which is sporadically impregnated with large keratinous spikes. It has two dorsal fins in place of a single one, as well as an extra set of pectoral fins further down its torso. These extra fins provide it with superior bursts of torsion when rending and tearing its prey. There have been accounts of smaller wayward fishing vessels that have wandered too far into the open sea, and were later found to have been bitten clean in half by a hungry Kaiser Shark.
The one saving grace against this predator is that it has ultimately become to accustomed and tethered to its irradiated environment. While they can be found outside the South Harbinger Sea, they will gradually enter an extended state of torpor, swimming around lethargically until they reach their toxic homes again.