By noon, Qi Xuansu returned to his office and spoke via his mind voice. “Elder Lin, where was the original exit of the underground palace that you were in? I’ve been rethinking it—that Yin-Yang Gate in Qian Xiangyun’s study must have been modified by her. After all, people from your era didn’t have that many cannon models. How did she enter the underground palace before that?”0

Lin Yuanmiao replied, “There were originally two exits from the underground palace. One was destroyed, severing all connection to the surface. The other is the Yin-Yang Gate you came through, which was originally a back door. If you know the exact location, you can connect a temporary Yin-Yang Gate to the underground palace’s permanent one. As for how Qian Xiangyun knew how to open it, I’m not sure. But I’m certain she only knew the surface mechanism. She couldn’t open the Yin-Yang Gate on her own, so she must have had a formation diagram. The cannon models on the shelves were merely used to hide it.”0

Qi Xuansu understood. It was similar to when he opened the Ghost Kingdom’s Yin-Yang Gate. The Ghost Kingdom’s location was fixed, but the other end of the temporary gate could vary. He could open one...0