Zero Build is a secondary game mode in Fortnite: Battle Royale that can be played in Solo, Duos, Trios, or Squads. In this mode, building is disabled, but the Overshield mechanic is enabled.This mode is more focused on movement,aim and game sense since you can't build to create cover for yourself. the overshield mechanic is a extra 50 shield that is added during zero build matches that regenerates after a certain amount of time of not taking damage.