Is the strongest skill in the world an active skill? No! It's a passive skill! What is a passive skill? A passive skill is an instant active skill, a killing move that no one would guard against, the ultimate trump card that only the dead can know! Can you explain it more simply? Breathing, strength, perception... Haha, is that it? Xu Xiaoshou tore the star river with one sword, shocking the world. ... Is this also called a passive skill? Yes, sword mastery.