Could this be Medici? No, his appearance and bearing are somewhat different from the "Angel of War" Klein described seeing in his dream. Could he be Sauron or Einhorn? I remember that when the three-in-one evil spirit was struck by "betrayal" and scattered, one of them collided with the Mirror Person and was taken away with her...
Angel studied the tall man, who wore only a single black robe. His red hair was long, and his reddish-brown eyes held a faint hint of mockery. He looked back at her with undisguised anger.
Of course, he expressed it only through his face and made no untoward moves.
After leaving that combined state, this fragment of the evil spirit probably retained its original standing but no longer had the power to hurt anyone... Angel chuckled inwardly, turned to her Mirror Person, and asked tentatively:
"Einhorn or Sauron?"
"He is the ancestor of the Sauron Family, one of the Fourth Epoch's Conquerors. I imagine you know about his entanglement with Einhorn and Medici."
The Mirror Person answered. She looked exactly like Angel, even perfectly reproducing the changes brought by Angel's advancement—the beauty now tinged with a heart-stopping sense of danger.
"I know some of it. For example, Alista Tudor killed all three of them and took their Beyonder characteristics. He used those to advance to Red Priest rather than the Black Emperor he had originally planned to become. They merged into a single evil spirit and remained in the underground ruins for over two thousand years, only being released recently."
Angel spoke based on parts of Roselle's Diary, Klein's conjectures, and her own deductions.
"Let me add something. Medici was the one who challenged us first, hoping to become a true god in one fell swoop. That was what gave Tudor his opening."