After hearing what Roy said, Tyrael felt his heart tighten. He immediately recalled his arrangements for the entire matter in his mind, afraid that there would be any omissions or details that he didn't notice.
However, after going over everything, Tyrael could guarantee that he didn't miss anything.
The Black Soulstone had long been destroyed, and this Tomb of Rakkis was only an empty shell that he used to lure demons. From beginning to end, no demons had entered this place in advance, so it was impossible for this demon king to make any arrangements in advance.
The only possibility was that Demon King Osiris's strength seemed to have exceeded his imagination.