Bringing in the Sorcerer Supreme had not originally been part of Xia Zuo's plan, because he had intended to deal with Mordo alone. But after reading the Book of Cagliostro, Xia Zuo had changed his mind.
He wanted to acquire more magical knowledge, but he had already read most of the books in the magic library, so they were no longer of much use. Now, the only magic books in all of Kamar-Taj that Xia Zuo had not read were those in the Ancient One's private collection.
If Xia Zuo killed Mordo outright, the Ancient One would definitely never let him access her private collection again. That was inevitable. After all, Mordo was her disciple, so killing him outright would be too much of a waste.
Squeezing every last bit of value out of his enemy was Xia Zuo's goal. That was why the Ancient One had been brought here: Xia Zuo was deliberately doing her a favor.
"Mordo, you've disappointed me terribly."
The Ancient One looked at Mordo in disappointment. In fact, when she first met him, she had known his character was flawed. But she had still held out a little hope for him, which was why she had accepted him as her disciple. She had never expected him to do something like this, and she felt deeply disappointed and weary.
"No... no... no! Sorcerer Supreme, listen to me! I really never intended to do this! It was all that damned Kaecilius and this damned brat! If it weren't for them, I would never have gone this far! Please believe me, Sorcerer Supreme!"
Mordo pleaded desperately with the Sorcerer Supreme. He was utterly panicked, unsure what else he could say to make her believe him. But he knew that, with her abilities, she could definitely distinguish the truth