Council of Fie
The council of fie are the original opposition to the wisps. Rumoured to be a group so cynical they can see through any illusion, even in their sleep. Nobody alive claims to have dealt with the council. Those who falsely claim the backing of the council don’t live out the night.
By this virtue alone, most believe the council to exist. In some states an oath of truth can be sworn on the mercy of the council. Those who swear it lightly, or in vain face a grisly death.