Im writing Xandrius as we speak but here you go
Unvaris was born when Orieon created the heartshaper. It is the other half of the bonded pair. Unvaris is everything that The Heartshaper is not. It is the embodiment of pain, suffering, hatred jealousy and all of the other emotions that the Heartshaper has dominion over.
Unvaris is not an evil god by any stretch of the imagination. It merely is. It is the other half of a being that is not inherently good simply embodies the more desired emotions.
Unvaris Clerics are never willing. They are always those who suffer and continue to suffer, cripples, those in pain and others who constantly stuffer or hate.
Unvaris churches are places of pain. Anywhere the pain has become so intense that it is allowed to manifest in a physical form Unvaris itself has made the place holy. All of Unvaris churches have a Geist. A physical manifestation of suffering or misery. They are occasionally called Pain elementals
Edit: super quick aside Orieon is the Titan that created the universe
