Selmak wrote:
This can happen if someone else is on an improperly-configured shared connection (two computers playing NWN behind the same router) meaning their character gets saved into your vault due to the instability such a shared connection causes. Or something.
This is the answer. They still have their own character though. Just don't log it in, it'll autoarchive, you don't need to worry about it. It won't compromise your vault or their vault or anything.
Locked as requested. Folks, keep that sort of random chatter off in offtopic, please.