The gnomes back away, afraid. They will not enter.
When you enter, something strange happens. The golden cube lights up as you cross the threshhold. The intertwined runes and designs on one side of the cube light up to form a recognizable word.
That word is "DARKNESS."
Once crossing the threshold, the cube lights up a 10'x10' square area around you. The light is dim, and it is still very dark in the room. However, a directed beam of light--like a cylindrical conduit--connects from the golden box to something in the center of the room, and from that thing to the far north side, giving you a dim but at least some vision of an exit passageway on the far side.
That thing in the center of the room is an ornate altar with a dragon twisting around it. The mouth of the dragon faces up, is open, and holds in its jaws a pinkish gem about the size of a person's open hand. It is through the gem that the light flows. The gem is a huge, cut jewel, its facets flashing with a fiery light from the light of the cube you hold.
The exit at the far end ("north") is a single arched exit.
The floors here are made of hexagonal flagstones (as indicated in the map). Each stone is polished marble but is covered in ancient dust from disuse over the eons.
You currently stand in the two bottom hexagonal flagstones. Please indicate which way you will move from here in the darkness--northeast, northwest, east, west, southeast, southwest, and indicate if you start in left or right hex. Each hex is approximately 5 feet wide.
The person holding the cube will bring the 10 feet radius of light (although again, it is a very dim light) with him. Those stepping outside the radius will be walking into complete and absolute darkness.