You decide that a tomb inspection might be a superior idea to outright theft, and resolve to touch as little as possible.
3
Not that you're not terribly tempted by the gold-clad mummies decked out in rubies held in the more ostentatious sarcophagi - what you're interested in mostly are the stone tablets that most of them invariably tend to hold - they seem to contain a name as far as you can tell, and a list of titles linked to accomplishments of some sort, and finally a glyph you can't quite place at the bottom, styled a little differently for each mummy.
After one of your minions is suddenly melted as they inadvertently set off a well-hidden acid trap by attempting to snatch a tablet from a mummy's hands, you decide make a set of delicate charcoal rubbings instead - the mummies fortunately don't appear to mind this, and neither do you hear any sort of alarm going off as you put everything back broadly the way you found it and slink off toward the vault.
As expected, the door to the secret repositories is massive, easily the height of three men, hewn from the very bedrock and covered in reliefs of rather familiar-looking people. Though made of stone, they look like they might actually be articulated to some degree. There is a giant steel valve on the stone door, and beneath it you see a head-sized sphere of black onyx, next to which hangs a stylus on a gilded cord.
Operatives Left: 10/12A) Puzzle out how to get through this door the way its constructors intended.
B) You've got time. Might as well break out your tools and tunnel into the vault through a wall.
C) Looks like this door is ensorcelled somehow. Brandish a symbol of the Stormrider to coerce it into your way of thinking.