Religious quests.
swearing to a deity will allow you access to a new quest with the diety person in HoL(the religious voice people)
So anyways, this is a mid-high level quest with a clicky reward that summons an NPC (NOT A PET) that would do something spectacular, but with an AGONIZING recast for balance. Im not sure how it would work, but they would either heal, damage, or give a protection for a short while(to those in favor of the god perhaps? and nearby?)
anyways, just something allong the lines of a religious reward would be cool IMO.