The End of the World: My Residual Energy System?

The end of the world is coming, and there are dangers everywhere. I have awakened the residual energy system of the world. Rat charm? It can only drive thirty kilograms of objects, and the shelf door is just right; cow charm? Three times the force can't last ten minutes, and it's more than enough to smash a zombie's skull; Dragon Talisman? The power is reduced by 90%, which is enough to break the circle surrounded by corpses. Other people's abilities are ruinous, but mine are all defective. But so what? You can kill zombies, build a base, and become the strongest king in this man-eating apocalypse!