by KarasuG
The Vault never closes unless something tells you to close it.There's only one Haunt that I know of where the Vault's open/closed status is at all important. #34 from the first edition, Mad, Mad World.
[o]Heroes are supposed to lock the traitor and the monsters in the Vault by making the roll on the tile. It takes the regular roll to open it, but they can close it for free. And once it opens again, the traitor/monsters are not allowed to escape - being locked in is essentially equivalent to death, but the traitor doesn't drop any of their items.[/o]