Chapter 106: Four-in-One, Zhang Su's Breakthrough, Hundred-Day Huajin

The oil lamp on the table had burned out at some point, plunging the secret chamber into complete darkness.

Only the faint light emanating from Zhang Su's body flickered in the darkness, appearing and disappearing.

The light pulsed, sometimes glowing with a faint red hue, other times shifting to a ghostly blue, as if two forces were clashing endlessly within him.

One hour.

Two hours.

Three hours.

Zhang Su's clothes were soaked through with sweat, clinging tightly to his body and revealing the firm, well-defined muscles beneath.

His face alternated between flushed red and deathly pale. His lips were pressed into a thin line, and his brow was furrowed deeply.

But even so, he didn't make a single sound.

Suddenly, Zhang Su felt a change.

Amidst the constant collisions, the Extreme Yang Inner Strength and the Extreme Yin Inner Strength had finally begun to fuse.

At first, it was just a few strands slowly weaving together.