This sounds like a CK2 event for the satanic secret society.

"On their journeys some of your brothers and sisters under Satan stumbled upon a goat with strange forward facing eyes. As the blade pierced the animals heart it is consumed by a sulphurous fire."

"Why did I hear screaming?"

"A few minutes into cleaning the ritual room a vibrant rainbow of fires and smells burst forth upon the ritual dias taking several of your brothers. As the fire clears you see the goat has returned with small yellow squares of paper attached via adhesive to the goat. They are all signed by different gods and demons."

"This raises many questions." (+3 diplomacy)