Remains
The aliens that built the crystal ruins always fascinated Ves. Through his continued proximity to the crystal city, he imagined an increasingly detailed picture of their race.
The crystal builders very likely evolved from a terrestrial planet not too divergent from the terran standard. This meant they likely looked like organisms from the terran animal kingdom. Throughout the galaxy, nature often led to the same solutions to the same problems. That was also why humanoid-looking aliens were remarkably common in the galaxy.
Some radical scientists even believed that some outside force had artificially inflated the prevalence of sexually dimorphic humanoids with two arms, two legs and a head. Of course, no one believed them. The most predominant theory was that the shift from walking on four limbs to walking on two limbs freed up the forelimbs for the usage of tools, which subsequently led to the birth of civilization.