Mysterious figure
The ruins that Lex and the group had encountered were not large. Though covered in plant growth and suffering from obvious signs of wear, some of the buildings had collapsed roofs or walls, even combining all of them there were less than 10 buildings. That meant this was too small to be a town or even a village, if those existed in the Crystle race culture. Lex assumed that this must have either been a travel outpost, a small research camp, maybe even the private property of someone rich, or something along those lines.
A small, adventurous part of him had been hoping that when he entered the building, through some mystical magic or miracle of the Crystal race, he would discover the interior untouched by time, and whatever event drove the race from here. That clearly wasn't the case.