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Gu Chen's martial arts cultivation was profound, and the demon spirit's shrill howl alone was naturally unable to harm him in the slightest. Not only that, feeling the formidable strength of the demon spirit within Lian Xing, Gu Chen's eyes lit up.
Because the stronger the demon spirit, the more merit points he could gain by slaying it.
Layers of black Qi continuously surged from within Lian Xing's body. However, his stature did not increase, nor did he transform into a beast-like form as the demon sect martial artists had when they merged with demon spirits earlier.
Instead, the dense black Qi behind him gathered and took shape, transforming into a ghostly black figure with ferocious eyes staring at Gu Chen, sending chills down one's spine.
Only when the degree of compatibility with the demon spirit reached its peak, achieving a perfect fusion, would it be like this, with no discernible difference between Lian Xing and the demon spirit after fusion.