There are many possibilities of there being a new creature added to SoT.
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Basilisk/Phoenix - A deadly flying lizard or bird, made of flames, that resides in the Devil's Roar, slumbering deep in the region's volcanoes, be it on island or out in the sea, it can attack at any moment and can be hit broadside when it comes flying towards either side of the ship before it can set fire to your vessel with its mouth or grab a crew member with its claws.
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Hydra - A long snaked sea serpent that can slither around ships and spew poison from its mouth, it's head can be destroyed, but can regrow (not many, just one head), and can be damaged with fire to keep it from growing back fast.

