This is an optional scene which can happen if the group decides to investigate the origin of the artifacts.
Because this scene is optional, visiting it will mean the adventure runs longer. You may choose to shorten this scene or hand-wave it.
For reference, though: if the group comes here, this is what happens.
What Happened Here
Normally there are four people working at Dig Site Five.
Laila Bhanad is in charge of the dig. It was her money that financed it. She's hoping to find new magic items comparable to the Miracle Spring.
Juram Bhanad, Laila's husband, is a sage who speaks Draconic. He's been helping to translate the writings in the tomb.
Vic the Walker is a large man who does physical labor, including most of the actual digging.
Bryce Sandseer is the group's trapfinder, and is secretly a cultist of Tiamat.
Yesterday, Bryce finished bypassing the traps on the tomb, and the group got access to the central vault with the six Draconian relics.
(Bryce would have preferred not to have company for this, but Laila insisted the group explore it together.)
The group identified that the six artifacts were non-magical (since they hadn't been awakened by the touch of blood). Laila and Juram concluded that they were harmless relics and should be sent to the museum. Bryce knew that they were artifacts of tremendous power, but couldn't figure out how to awaken them. Over Bryce's objections, the group shipped the artifacts to the museum in town.
(Juram did notice a bunch of writing on the walls, claiming that the six objects were artifacts of tremendous power, but since they clearly weren't, he concluded that this was some sort of weird draconian bragging and disregarded it.)
Overnight, Bryce went and reset all the traps in the dig. Then he left, to join with the other cultists and attack the museum. He was one of the four cultists killed at the start of Martha's rampage.
Laila and Juram are now trying to get back into the dig site, but they can't find Bryce and they don't know why the traps are re-enabled. They're happy to answer any questions the group has, but they don't remember all the contents of the writing down below. (That's what they were planning to investigate today!)
Traps In The Tomb
If the party decides to forge forward, they face three rounds of traps. All of these traps are activated by pressure plates in the floor, which Bryce had carefully outlined in chalk. Last night he erased the chalk.
The first trap is a rolling-boulder trap. The group enters a long corridor which slopes gently downward. The floor is grooved in a way that would let a spherical object fit snugly into it. There are three pressure plates, each of which could trigger a rolling boulder. The boulder falls from the ceiling at the start of the corridor, rolls rapidly down, and drops into a deep pit at the other end. There are a total of five boulders in the ceiling.
The second trap is a pendulum-blade trap. Each of three pressure plates will trigger a pendulum blade to come out of the wall and attack whoever steps on them.
The third trap is a snake trap. A narrow ledge overlooks a snake pit; three pressure plates on the ledge will cause the ledge to pull into the wall, dropping the group into the snakes. The snakes are all dead, since they're hundreds of years old and they haven't been fed. However, many of the snakes are now undead and will happily attack the party, given the chance.
The Vault
The vault is dense with writing -- the ancient draconians had a lot to say here.
The group finds long poems and songs, mourning all the people who were killed by the weapons buried here.
The group finds detailed descriptions of each of the six weapons. The descriptions don't say explicitly that Stonebreaker can destroy the others, but Stonecrusher is referred to as "the All-Destroyer", which might be a valuable hint.
The group finds reference to the golden gloves, and caution to always wear the gloves when wielding the weapons, to provide some measure of protection against their mind-control powers. The gloves themselves are in the museum now.
The writing tells the history of the last days of the Draconian Empire, and of the forging of the Miracle Spring. This would probably be of great interest to a historian.
Armed with their new knowledge of the relics, the group hopefully now decides to head back to town...