The depths of the underground palace were mindblowing. Despite pressing forward for a long time in the thick turbid air, the passageway was still as narrow as ever. Yun Che maintained his invisible state as he carefully followed behind the three men. He had no way of going past them. He felt uneasy, but he wasn’t anxious.

“Why aren’t we at the bottom yet? How deep is this place?”

“The turbid air is growing heavier and heavier… but the passageway is now level, we ...