Traitors
From Official Barotrauma Wiki
Template:Stub Template:Modes nav Traitors is not actually a game mode, but rather a toggle-able feature that can be enabled on servers in Barotrauma. Thus, it is only available in multiplayer.
Gameplay
With this enabled, a random player will be chosen as the traitor, and must kill another member of the crew. The other players must kill the traitor or reach a destination before the target is killed.