I Went Mad and Became a God

An invincible story, with an invincible protagonist from beginning to end. No female lead, no CP. The protagonist exists outside the cultivation system.

Three years ago, Su Bai, the youngest son of the high-martial Su family, awakened an SSS-rank Sword Saint talent. But after someone sabotaged him and stripped him of his ability to cultivate, he became delirious and developed dissociative identity disorder, gaining a second personality called Xiao Hei. Cunning and mysterious, Xiao Hei claims to come from a higher dimension of the universe. Su Bai also begins seeing and hearing things that aren't there: monsters that don't exist and wandering spirits. He discovers that the world is a simulation game and cultivation is a massive scam. Xiao Hei teaches him how to wield his soul and consciousness. He learns the skill "Sever," which can cut through anything, and "Erase." Since the world is fake, he can erase his enemies at will. He also gains flight, control, and other abilities as powerful as bugs. Though he is no martial artist, he becomes the god of this world.