Jedha
The four explorers head cautiously into the cave. Light reflects continuously from the outside so that - while not blinding - the whole cavern is lit enough to see in without help. The ground itself seems made of crystals crushed to find powder like sand.
"Careful not to stir this up," Vyctor comments wryly. "It'll be a pain to get it out." His voice echoes oddly in the cavern, and there is a low pitched hum as his voice causes the crystals to resonant several seconds after he stops speaking. His eyes go wide and he clamps his lips shut from that point on.
There are many hidey-holes, offshoot tunnels, and formations to hide behind, but the main path is clear. It meanders back and forth around larger formations but generally heads east.
"Captain," Irin whispers. "According to this, we are surrounded."
As she speaks, the group rounds the last formation to come upon a huge amphitheater in the ground. There are waves of crystal that create upper, mid, and lower sections for spectators to stand. In the center of the floor at the bottom, there is a crystal altar up on a wide, flat stage.