Fogeater (religion)
While nobody has ever managed to communicate with the Fogeaters, one of the only things verifiably known is that they name themselves the 'Listeners'.
The result of tribal humans being trapped in the Foglands, unlike all other beings who had been destroyed by the Foglands millions of dangers, the Fogeaters instead adapted. Or, as one would think when looking upon their malnourished, nearly alien forms, corrupted.
The Fogeaters worship the Fog now, and devour or corrupt any they capture in disturbing esoteric rituals meant to assist them in speaking with their esoteric masters.