You think you have your priceless artifacts secure, that no adventuring party could possibly ever get at them. Around the clock security, hundreds of magical traps ready to go off at a moment's notice. Everything in place for your master plan. But then, when the planets align and you crack open the vault, its missing. The centerpiece to this whole apocalypse cult. No traps set off. No signs of entry. Just a completely empty vault, missing the artifact and all money.