The closer those flying knives got to Duan Gujin's body, the faster their flight speed became, and the more intense the explosions in the air grew.
The sound was like thunder; if not seen with one's own eyes, no one would believe that such terrifying explosions were actually made by some flying knives, thin as a cicada's wings and only the size of a thumb.
Under the propulsion of the internal flying array, the speed of those flying knives had reached a terrifying five times the speed of sound.
Though small, these flying knives created a thunderous explosion with the air due to rapid friction.
Of course, such flying knives could not be made from ordinary materials.
To craft flying knives that can endure such terrifying friction, only those very rare advanced materials would do, materials that only the Taihuang Immortal Sect could obtain here on the Yuanzhen Continent.
