When he punched the Kaff spear, Chu Nan had already felt that something was wrong.
The cold and sharp aura coming from the Kaff spear was clearly extremely similar to Internal Breath, but there was an obvious difference.
Most importantly, this extremely cold and abnormally sharp aura even gave people the feeling that it was humming at a high frequency.
Later on, after Chu Nan's right palm lightly touched the shaft of the Kaff spear and his right fist firmly collided with the spear, the two sensations confirmed his judgment.
The strange aura coming from this spear was definitely Internal Breath that had been fused with a special high-frequency vibration state!
The reason why this trait appeared was probably not only because Cardu cultivated a special Internal Breath cultivation method, but also because of the special material of the spear that he had mentioned many times earlier.
This discovery made Chu Nan feel strange.