My Whole Family Is Invincible, So It Doesn't Matter If I'm Left Out

[Overpowered Identity + Swordsmanship + Lighthearted] I transmigrated to a world of cultivation and became the young master of the most powerful family across the myriad realms, only to discover I had no talent for cultivation whatsoever. So I decided to lie flat. The Supreme Ancestor was always saying, “There’s a difference between having no sword in your hand and having a sword in your hand but choosing not to use it.”

It wasn’t until immortals crossed into our world, demons ran amok, and the Demon Lord invaded that I finally understood: “So I’m the nuclear bomb?”