Kraken

Kraken Krakens number among the most terrifying denizens of the sea, their wrath capable of ruining entire poleis. Under normal circumstances, each kraken is bound by a sea lock, a magical effect that restricts its travel. The area encompassed by the lock is large enough to enable the kraken to feed but prevents these near-immortal beings from raiding densely populated regions. Some stories claim that a seaquake or other natural disaster might break a sea lock and free the kraken to rage as it pleases. Other tales, though, suggest that sea locks emanate from ancient coral weapons buried in the ocean depths and that keep a kraken tied within a few hundred miles.