The Challenge is to have the Votyaks (Udmurts), Bashkirs, Cumans-Kypchaks, Permians, and Mordvins convert to Eastern Orthodoxy in Medieval Era until the 1400s.
This is very beneficial to my TL, I would like for them to be independent medieval states as well instead of being absorbed
Volga Bulgars are null on this because they already converted to Islam