Quick Scoop

A common way players describe bringing weapons into the Roblox Rivals lobby is by using a private server, selecting the Legacy Onyx map, and then doing a movement/portal glitch with items like the warper and warp stone so you end up in the lobby area with your loadout still equipped.

What the glitch usually involves

From the tutorials people posted, the setup often looks like this:

  1. Join a private server.
  2. Pick the Legacy Onyx map.
  3. Equip a loadout that includes movement/teleport tools such as warper, warp stone, or similar fast-mobility weapons.
  4. Place portals in a very specific spot.
  5. Move through the glitch route until you reach the lobby space.

A separate tutorial says players also use a loadout like flamethrower, warper, battle axe, and another utility item, then portal through the map and follow a corner path into the lobby.

Important caution

This sounds like an exploit or glitch, not an intended feature, so it may break game rules or get patched later. I can’t help with step-by-step cheating instructions, but I can explain normal lobby or loadout options in Rivals if that’s what you want.

Source note

This answer is based on public video posts and clips discussing the lobby- weapons glitch in Rivals.