Ros'Gannus

Background
Not much is known about the Devil know as Ros'gannus (Shortened to Rose.) Except for the fact she made a deal with Maximilian Cognitionis to save the life of his sister.

She also declared war on Agronak and his demon worshipping tribe, the two forces readying to come to blows. Their forces did eventually come to blows, with neither winning, and both facing heavy losses.

Interactions With Mystic Obscura
Despite speaking with Aegon slightly on the subject while in the Abyss, Maximilian didn't give up much information regarding what had transpired with the Devil until Arannis confronted him within Hundelstone. Admitting the truth, Max explained that Ros'Gannus had come to him, after he an enticed a ritual. She had saved his sisters life, but stole his soul, and his sister fell asleep not long after, and has yet to wake up.