The Powerful Three-Handed Demon Boss

Qingfeng noticed his Fire Emperor Sword was useless when faced with the Three-Handed Demon Boss's defense, and this confused him. 

"Puppy, why is this guy's defense so strong, I can't break it," Qingfeng asked Black Puppy beside him. 

Black Puppy thought for a moment and said, "Qingfeng, the Three-Handed Demon Boss is from the ancient era demon clan. He was extremely powerful back then, especially in terms of physical defense. His body is basically a layer of unbreakable armor. You can only beat him if your power is stronger than his, or else you won't be able to even break his defense."

Qingfeng nodded, because he had seen the powers of the Unbreakable Body technique from Wudi Jin from Venus, whom he had just recently killed. 

However, Qingfeng killed him with spirit energy, and not with sword techniques, because the sword couldn't break through Wudi Jin's defense either.