[@Mae] Rex's legend: The people known him as the god of corruption and sacrifice, as well as the emissary of destruction and end of days. His worship is frowned upon by most, though there are still those who came to him bearing sacrifices of blood in hope that their wishes be answered. However, sometimes in rare and forgotten text, a scholar might stumble upon the name Rex, but the descriptions and the stories they told seem to be of a different god altogether. 
 A ritual to reach the god of corruption is said to require the blood sacrifices of your dearest loves, though its exact procedures are unknown. However, it does not stop many of his worshipers from improvising.  

 PS: I made a cult cause why not. Free bloodstained togas for everyone!