Without a fatal threat, no family would be willing to risk being annihilated to deal with Lu Tianxing, as it's not worth the loss.
But if Lu Tianxing uses Yang Tiansi to successfully bring down the Yang Family this time, it would pose a lethal threat to other families, who would believe he has the power to destroy an entire clan. At that point, those families would spare no effort to kill him, as no one wants to see one person dictate the survival of a family.
Mu Qingxue was slightly taken aback upon hearing Lu Tianxing's words. She quickly understood the implication; if Lu Tianxing could truly single-handedly leave the Yang Family defenseless, that would be the most dangerous time.
