I recommend the book "Unlimited Dungeon Raid in the Apocalypse" to you. The main character, Xu Feng, has been reborn to Earth 500 years after the apocalypse. He carries the dungeon system and can kill monsters that he has already killed without limit. The protagonist has obtained the Overlord Level weapon, Heavenly Dragon Overlord Halberd, which is very suitable for the plot you provided. I hope you like this fairy's recommendation. Muah ~😗