Zero Online is a sci-fi online game developed and published by 91 Entertainment. In the world of Zero, the players no more play as warriors or mages in a desolate land but the pilots who master high-tech weapons, fighting in the immense universe. Shuttling between the numerous galaxies, the units of various forms and functions are navigated by the pilots to fight against ferocious alien enemies. It is an epic war: battling for the Earth Alliance is the pilots' ultimate honor and eternal duty. Zero Online offers various units of incredible power for the players to pilot. To survive under varying battle conditions, these units are classified into two types: Infantry and Artillery.