OOC:
still waiting for any player to announce any action. Meanwhile I can share what you can see inside the tomb - now as next to the skull you get a perfect view inside.
Skulls crusted with dried mud glower from niches cut into the walls of this tomb. A stone sarcophagus stands at the center of the chamber, its lid adorned with a coiled serpent carved in relief. Behind the sarcophagus, resting atop a marble pedestal, is an ornate crystal box with a small humanoid skull floating inside it.
A maze of tiny passages is cut into the walls beyond the niches. Passages are too narrow for Medium and larger creatures to enter, and Small creatures must squeeze to traverse them.
[ +- ] Squeezing into a Smaller Space
A creature can squeeze through a space that is large enough for a creature one size smaller than it. While squeezing through a space, a creature must spend 1 extra foot for every foot it moves there, and it has disadvantage on attack rolls and Dexterity saving throws. Attack rolls against the creature have advantage while it's in the smaller space.