The Sisters

The progenitor-gods of the Still Sea-setting, the Sisters, or the three Sisters are the deities Vena, Atar and Xil.

They represent, respectively:

Vena : All things growing and living, everything within the sphere of the animus.

Atar : All things still, constant, unmoving and dead. Note constant; Knowledge and wisdom are considered within the sphere of Atar, as is (politically, perhaps) the patron deity of the Empire of Nine Silks.

Xil : All things transitory and in flux. Things that persist for but a moment, and also things that pass from life to death, and the other way. Xil is considered evil, and her worship is mostly forbidden, or highly controlled. Only through the favor of the goddess Xil can resurrection be achieved, and always at a horrifying price. She isn't just a necromancers evil patron, though; Music is in Xil's domain, as is performing arts in general, and rites of protection for the unborn or the pregnant are carried out illicitly all over the world.

The Sisters aren't generally objects of popular worship around the Still Sea, but rather like the titans of greek myth, are considered forefathers of the gods, and representatives of the concepts and struggles that order and inform the worshipped gods, who are generally divided into families as the Xilian, Ataric and Venatic gods, depending on what their domains encompass.

That being said, there are, of course, spirits and avatars of the Sisters to be found around the world.