My guess would be that one of the goddesses and a demon where in love then they had a baby together but a powerful demon lord did not want it so maybe he killed the goddess and imprisoned the demon. Then a war broke out between heaven and hell. Then there where bunch of demons who are sitting around a table it seems like they are celebrating. Any thoughts on this?
Nice observation, I also saw this and wondered about it. I dont think people stopped to enjoy little bits of information like these. I didnt really analyzed it too much, but if I would, i would take screenies of each of these murals. I have the same conclusion as you.
Except all the Demon Lords are female, so far… Unless Rexipher turns out to be your Father. XD