I Am the Lord of the Great Desolation and Heavenly Tribulation

The male protagonist is accidentally reborn in the ancient world, and gets dual systems at the beginning, one upgrade system and one downgrade system. You can control the level at will, constantly upgrade, downgrade and refresh skills. Magic weapons: Black Coffin Carrying, Words and Laws, Misfortune, Three Burials of Ghosts, Desperate Rebound, Jumping Oboi, Disaster Poison Body... When you encounter an enemy that you can't defeat, drag him through the catastrophe and downgrade yourself to escape far away! The system's temper is not very good. It will self-destruct if it disagrees with you. When it self-destructs, it will produce extremely strong Honkai energy. The souls of all living things within the explosion range will be scattered. The only way to stop it is to make the opponent kneel down and sing "Conquer"... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.