The crysilin were one of, if not the most unique race ever to walk Calsin. Composed of living crystals, they were first discovered by the dwarves during a particularly deep mining mission. A sinkshaft drove thousands of feet lower than any dwarf had gone before, below the level thought habitable. When the dwarves descended down the sinkshaft, they found a species literally made from gemstones. 
Of course, dwarves being dwarves, the crysilin were instantly treated like animals and harvested for their crystals. Initially, they were treated more like livestock, with attempts being made at maintaining the populations, but then it was discovered that the gemstones that composed the crysilin offered enchantments more powerful than anything the dwarves had ever seen before. Within a century, the last surviving crysilin died in captivity, where it was subsequently harvested and its enchantments worked into a commemorative statue.
It was not understood for nearly five years after their discovery that the crysilin were actually sentient beings. Physically, they walked on four legs and had few features that resembled the other sentient species of the land, and so some levity can be given to the dwarves in this case. However, even after the discovery was made, only a handful of dwarven scientists made any attempts to communicate with them, and almost no success was recorded. It is unknown if the crysilin were even able to sense the dwarves or understood what was happening to them.

Height:
- Varying depending on age. Young crysilin could be as small as a foot tall, while the elders could tower well over twenty feet high.

Unusual Characteristics:
- Composed of living crystals.

Coloring:
- Nearly any color of the rainbow.

Lifespan:
- Unknown, since the dwarves didn't observe them for a long enough period of time to see any die naturally. That said, the handful of dwarven scientists who were able to make observations estimate that their lifespan is well into the thousands of years.

Magic:
- Unknown. None was observed during their captivity.

Worshiped gods:
- Unknown.

Other notes:
- The crysilin were past the point of no return when word of their existence leaked to the outside world. Within weeks, scientists and mages from every nation across the continent arrived, demanding to see the creatures. This nearly resulted in a war between Taninor and Elsinor, as several (admittedly pushy) elven scientists tried to break into a dwarven fortress after being denied access.
- The series of caverns that the crysilin were found contained around two hundred miles of intertwined caves. It is thought that the crysilin carved the tunnels themselves, eating the minerals in the ground, but this is impossible to prove for certain. Additionally, while dozens of other sinkshafts were prepared and utilized, no other crysilin systems were ever discovered. That said, attempts were only made in Taninor, Dirnor, and Elsinor, which leaves a large portion of the world's underbelly unexplored...