Demonic Immortality

In ancient times, there were people from other sects who, in the name of summoning demons, wore black and red robes and played ghost flutes. Wherever it passes, living people get out of the way, dead crows hover, ghost spirits gather, and bones come back to life. The powerful Nascent Soul seizes the body and rebuilds it, and uses the road of killing corpses and ghosts to become the most powerful immortal in the world of mountains and seas! (Note: The protagonist's personality is mainly cold, cautious, and decisive in killing, and his methods of action are more demonic.)