Greater Grail with Two Forms

Tohsaka Rin said in disbelief, "I really can't understand this. How is this possible?! The greatest point of divergence for the Holy Grail should have been whether Shiro Kotomine or Angra Mainyu was summoned during the Third Holy Grail War."

"If it was Shiro Kotomine, then it couldn't be the Black Holy Grail. If it was Angra Mainyu, then it couldn't be the Holy Grail! How could both states exist at the same time?!"

Corrupted Justicia smiled. "Because... our current state is actually very special. We are the Holy Grail that never experienced corruption, but also the corrupted Black Holy Grail. Our state came about because history changed."

Winter Saintess Justicia said, "The Holy Grail never went through the history of being corrupted and was never tainted by All the World's Evil. Yet, through history, we came into contact with that corrupted possibility. That is how we came to be. As a result, this Greater Grail possesses both the forms of the Holy Grail and the Black Holy Grail."

Semiramis said, "So your having both the Heaven's Holy Grail form and the Black Holy Grail form is a special case. It isn't because you contained Angra Mainyu's soul, nor because you came into contact with All the World's Evil. It is because of history's influence that you became like this."

"Mhm." Winter Saintess Justicia nodded slightly. "That's right. If we had contained Angra Mainyu's soul and come into contact with All the World's Evil, then we would only be the Black Holy Grail now. Only the corrupted me would appear, rather than both of us appearing together."

Corrupted Justicia smiled. "If it were the Black Holy Grail, then although we are both Justicia, I would definitely hold more initiative—unless she did not want to let me come out."

Mash Kyrielight