Chapter 640 The Scholar in Cyan

Dark green Demon Aura had been overcast, engulfing the entire Guo City sky like thick clouds. The aura flowed like a green liquid due to its corrosive nature, burning everything on its way while producing sizzling sounds. The light shield made by an inscription formation that had protected Guo City for thousands of years began to debilitate under the corrosion. It was as if it would collapse at any time. A huge demon of mysterious shape was looming in the midst of the green Demon Aura. Its four massive and bloodshot eyes emitted red light like sword radiance which bombarded the city's light shield.