Demon-slaying formation

The blood-red blade-light spread across the entire Imperial City, but it disappeared in the blink of an eye, as if it had never appeared.

The people on the outskirts of the Imperial City all looked up in the direction of Zhai Xing Lou. They did not notice a faint red light flashing under their feet. The red light was partly hidden and partly visible, and a thin black mist was lingering above it.

In the prison cell, Li Tian's eyes suddenly opened and squinted slightly. He looked at the black fog rising from the damp and dark ground of the prison cell, and there seemed to be a strange red light flashing in the black fog.

"This is ... Demonic Qi?" Li Tian said after a short pause.

He stood up and looked carefully. His eyes fell on the corridor outside the iron bars. Black fog rose and fell like dense clouds. A glimmer of light flashed in his eyes.

"This is a formation!"