Starting from Summoning a Tiny Robot

After dying from a losing streak in games, Lin Mo transmigrates to another world and awakens the F-rank weakest ability—summoning a palm-sized tiny robot. Classmates laugh at him as useless, teachers advise him to drop out, and rating agencies say he can't even scratch the skin of a D-rank beast. Lin Mo stays calm, instead networking and programming the robot to create 'Resonance Barrier' and 'Electromagnetic Pulse', turning the flashy ultimate moves of academy geniuses into scrap metal. Everyone thinks he's hit his limit and can only win through dirty tricks. Until the beast tide presses on the city, and that bottom-ranked F-rank loser slowly raises his hand at the city wall. A mechanical flood pours down, as if a god descends. 'Forgot to tell you—my ability is called Mechanical Sovereign.' — Description from novelcodex.org