Zehir

Zehir is the evil god of darkness and poison. He is the creator of the changelings, although they no longer revere him. Throughout the ages, Zehir has been the patron of assassins and any who partake in political intriques. During the Age of Chaos, changelings were prominent assassins and working for both the tieflings and the dragonborn. When it was learned that top figures on both sides were changeling agents plotting for Zehir, both the teiflings and the dragonborn began rounding up changelings and slaughtering them out of fear. For the sake of survival, the remaining few changelings broke all ties with Zehir.

He is also worshipped by the yuan-ti, and is often identified with snakes.