Comments of chapter undefined of Clan Leader: My strength equals to that of the entire clan

I have a sneaking suspicion that "knife" is an incorrect translation. They probably mean Saber, and Knife Power is just Saber Intent/Force. (A long knife is basically a Saber/Machete) Also, who knew MC would be this ruthless? I get killing the father and son, but even the wife? This is how I know I couldn't survive in a cultivation novel.