At this moment, in the Number Three Dungeon of the Heavenly Order.
Zhou Yu sat cross-legged, with his eyes tightly shut and utterly motionless.
However, if one observed Zhou Yu's expression closely, they would discover that, although his eyes were closed, a faint excitement flickered across his face.
His conjecture was not wrong.
Indeed, the whole setup here was designed to enhance the power of the Soul-Losing Bell Sound.
Zhou Yu, having been subjected to twelve waves of the Soul-Losing Bell Sound, initially suffered from soul shocks and spat out blood. But later on, he had gradually adapted to the Soul-Losing Bell Sound and had begun to divert his attention to studying its profound mysteries.
By mimicking the structure of the dungeon, as well as the way the seven sound waves of the Soul-Losing Bell Sound merged, Zhou Yu incorporated all of this into his Demonic Roar Cultivation Technique.