Honkai: Whoever's Stronger Is the Real Deal, Old Man

Novel title: Honkai, the Old Man Who’s Strongest Is the Real One

The protagonist transmigrates into the world of Honkai Impact 3rd, but as the Herrscher of Sentience, resurrected from Fu Hua’s body.

With the powerful body of a MANTIS, the Old Man’s ten thousand years of martial arts experience, and my own Herrscher Authority, watch me reforge my sword heart in one second and ascend to Sword God in three.

This is the new me, the new Fu Hua. What, you say I’m an impostor? Old Man, I’ll tell you this: whoever’s stronger is the real one.