Kraken

The Kraken is a titanic, monstrous creature inhabiting the seas of Haven. It is a being of horrifying power and malice, none that draw its ire walk away unscathed.
It is a terror upon ships and coastal towns, warded away with sacrifices and prayer, either to it or to the gods above. The kraken allows all of these, for while not human it is intelligent and allows itself to be appeased by mortals. It keeps and fosters cults, though it is never a benevolent master.

Powers

The Kraken has power over flesh and form. Its own shape is malleable, capable of forming new limbs, claws, eyes and so on at will, changing its entire body configuration in seconds. While it stays in the water always, its manyfold limbs and jaws can reach easily far onto land.
The Kraken is also exceptionally hard to kill. If it is ever harmed, its flesh will flow like water to heal any wound, severed bodyparts will mutate and come to life to attempt to rejoin with the larger host and if it is ever gravely wounded it will run and hide, feeding on other creatures to regain its mass.

However the most potent ability of the Kraken is that it can also change the flesh of other creatures at will. It can affect animals and people in accordance with its desires, torment them with alien visions, impair and cripple them or outright twist them into insane mutated horrors. The only defense is staying away, as distance from the Kraken lessens its power over your flesh.

History:

The Kraken is old, really old. Indeed it is among the oldest mortal creatures of the Brass Realms. It is the mutated remains of a Firstborn, twisted by Star-touch which it contracted during The Splitting of the world.
It originally lived on an unknown world akin to a feral beast, devouring ever larger prey and acquiring their traits and adaptations. Eventually it grew so large that it could not survive on land anymore and it had to move into the oceans of that world where it lived as a massive aquatic predator.
There it was found by a group of Jotnar explorers, and they eventually decided to bring it to Haven, where they would conduct many experiments on it, further empowering its mutative abilities and implanting it with control devices and devices to make it feel pain so they could use it as a weapon against the Sea serpents that were at the time waging war on the Jotnar for dominion over the seas.
Eventually the Jotnar unleashed the beast and it went and devoured many sea-serpents on their orders, but in so doing it grew larger and smarter and broke free of their control. The Jotnar would end up losing dominion of the seas anyways, just to the Kraken instead of to the sea-serpents.