Kyoraku Shunsui the Actor

"What was so strange about that?" Rukia stared at Renji and asked, somewhat puzzled.

"Captain Kyoraku's post-battle report made it very clear. While pursuing the injured Aizen, he came across Ichigo's final battle with Aizen.

"After that, a mysterious third party of unknown identity joined in the encirclement against Aizen. They said the scene was utterly shocking. And it was at that time that the Sōkyoku revealed itself."

As she spoke, she lightly tapped the air with her index finger, as though emphasizing a key point:

"Although the Sōkyoku is terrifying, its essence is still a sword. As long as someone has used it..."