Doomsday: I Can Upgrade Everything

The end of the world is coming, and changes are occurring. Instead of hoarding hundreds of millions of supplies, Li Chen chose to pull out his shiny ax and directly attack the unknown weirdness in the darkness. Rampant zombies, mouth-covered ogres, succubi that charm all living beings, and countless mythical creatures. Li Chen made an ax, and the ax had one more data: [Item: Broken Ax LV1 (cannot be upgraded)] [Experience: 0/6] [Introduction: An inferior weapon, relatively sharp. Every time you swing it, you gain a little experience. Every time you upgrade, the texture of the weapon changes from wood to steel. The final slash of the ax can split the tank into two instantly! If human beings can keep upgrading and reach infinite heights, they will one day be able to connect with the sky!