Sythis the Betrayer

The third head of the Three-Headed Serpent, Sythis is the god of betrayal, an agent of chaos within the chaotic Empire of Stygis. Depicted as rival, consort and constant betrayer of the Fearmonger, their interaction is a mad dance, mediated by the influence of Asphyx the Slayer.
Sythis has a wide variety of depictions, from riches to poverty, in all stages of Yuan-ti 'evolution' save the Anathema, although most commonly he appears as a malison in the robes of an adviser. He tends to only appear in the background of religious art dedicated to the other gods, with his own shrines being dark and shrouded in cloths, devoid of figural images. His priests are the mind whisperers, manipulators and tempters.