So yes, Qilin Kai didn't say anything. Whoever lied to this stupid half-blood made his job easier. It was never his responsibility to tell Emperor Rui the truth. The poor guy would only find out later that the so-called power he dreamt of never existed.
What exactly Qilin Hao promised the then prince Rui no one knows but from the look in his eyes, he was very determined. Qilin Kai lowered his head with a devilish smile as he agreed to this special request. "Sure," he said before raising his head staring at emperor Rui through his peripheral view, "but your in-law has the keystones and to get to Niuq we need them. I can-."