The Soul of the Goddess?

After hearing Sareth repeat what Rodin said, Roy and Sparda were very surprised.

"Who is this guy?" Roy asked curiously. "How does he know the secret of demon king promotion so clearly?"

"I suspect that this guy might be a demon king-level demon. Otherwise, it's impossible to explain why he knows this…" Sparda spread his hands. "It seems like the waters of the twin worlds are quite deep…"

Roy caressed his demon horns and said thoughtfully, "Madama Styx and the others know about Demon Rodin. They also said that he used to be an angel, but they don't know why and for what reason he fell. Heaven doesn't seem to have any information about his past, as though someone deliberately erased it."

"Foster Father, can his words be trusted?" Sareth asked.