Here is an overview of Zero Build mode, via Epic Games:
Zero Build mode is a pure test of weapon, item, and traversal ability. Zero Build can be found in the Discover page as Solo, Duos, Trios, and Squads playlists. (Access the Discover page by clicking on the “CHANGE” button above “PLAY!” in the Lobby.)
Without building, all players have the recharging Overshield as your first line of defense in Zero Build. Zip up Ascenders to access Blimps or use Mantling to get the high-ground over your opponents. Don’t forget to Sprint between cover on your way to a Victory Royale!
Watch a trailer for Zero Build mode below.