The Black Flags' Common Room is styled like an old pirate ship or a pirate hide-out. It occasionally starts raining, complete with thunder and lightning visuals and sound effects. There is a golden mermaid statue and skeletons of pirates scattered all over the place. The mast rises above the ship and a black flag flies over the crow's nest.
The mermaid statue in the Black Flags tribe room.
Early concept idea for the Black Flags common room