The Cult of the Red Grave
The Cult teaches a set of beliefs about the afterlife. What you do in life determines what your afterlife will be like. The dead and the bodies of the dead must be treated shown the greatest respect. An elaborate burial is to be performed. The tomb or grave must be red, either decorated with cinnabar or filled with red soil. Ancestors are to be routinely remembered. Specially prepared food is placed on sacrificial altars for the dead to eat (if the food is not consumed in a few hours the living can eat it instead).
Red is the high color of great respect. The Cult, influenced by the God of the Underworld created maps and directions to the Underworld.