After Qi Hao and the four others had left.
Chu Qingyun deployed his Swallowing Mud Worm Soul, which he hadn't used in a very long time.
He had, of course, also raised this Martial Soul to Tier Four.
Upon activating the Swallowing Mud Worm Soul, a two-meter-tall, earth-yellow, beetle-like Martial Soul Illusion instantly materialized behind Chu Qingyun.
Chu Qingyun's Primordial Power, along with the surrounding Heaven and Earth Primordial Power, surged into the Martial Soul Illusion.
After reaching Tier Four, the Swallowing Mud Worm Soul's technique was still Sinking into the Mire, which created a vast quagmire to restrict the movement of enemies over a large area.
However, the tunnel's floor, ceiling, and walls were all made of incredibly solid black rock.
As a mere Tier Two Martial King using a Tier Four Soul Technique, he certainly lacked the power to transform the black walls—rock that even a Celestial King Realm expert couldn't faze—into a quagmire.
