Aesi

Aesi, Tyrant of Gyre Strait is a serpent from an unknown plane.

History
On a distant, ocean-covered plane where monstrous creatures rule the seas, one, in particular, stands out in terms of temper and capriciousness: Aesi, an ancient sea serpent who claims the waters and all adjacent land-masses of the Gyre Strait as its domain. Fickle and unpredictable, Aesi has little patience for trespassers, aquatic or otherwise. The only way to appease Aesi is to give offerings and tribute, but even that's not a sure solution: it's been known to take the offerings and attack anyways if it feels like it.