Gravity Tyrant

Fifty years after the Great Cataclysm, civilization collapsed and all races invaded. Humanity retreats to the base city, and the level of superpowers determines everything. Class D is consumables and is distributed to the front lines as cannon fodder. S-class is a god's throne, high above the world. Sadan traveled through time and awakened the most useless gravity system. There is no golden finger, no grandpa, and no system. There was only a pair of fists and a rusty broken knife. Being kicked? Call back. Being called a waste? Hit him until he shuts up. Someone touched my brother? Destroy his whole family. From D-class consumables to gravity tyrant, from wasteland to the battlefield of all races—— Sadan only used one sentence: "Not convinced? Come and fight."