C333 The Mysterious Ancient Fortress Secluded Cultivation of the Soul

Soon, he found Duan'er.

On the walls of the dark gray ancient castle, there were many invisible formations with Yin Qi revolving on them, forming a unique Yin Qi gathering spirit formation.

He took a closer look at the surrounding space, which was filled with wisps of Yin Qi. They were gathering from all directions, and were all gathering in the ancient castle.

"Tsk tsk