F-Rank Awakening: My System Turns Trash Skills To SSS-RANK

Every human gets one ability for life. For the rich and elite, that means buying million-credit S-rank skills to rule the world. For Rain, branded an F-rank dud, it means being handed an F-rank skill which was basically a death sentence. He was supposed to accept his place at the bottom, to smile, take it, and thank the rich and powerful who called him trash to his face. But after a brutal event leaves him with two F-rank skills and a broken body, Rain unlocks a strange system interface that allows him to do the impossible: Synthesis. He can't buy S-rank skills. He can't change his low mana capacity. But watch what happens when a boy who refuses to remain weak and useless gets his hands on a system built to break every rule. BING! [Synthesizing...] [Material A: [Clean] — F-Rank] [Material B: [Decay] — F-Rank] [Synthesis complete.] [Skill Name: Void Erasure] [Rank: SSS] How does an F-rank trash become an SSS-rank god? Rain is about to find out. So is everyone who ever looked down on him. — Description from novelcodex.org