
Race/class summary: The race cannot walk, it has a racial short range teleport with a 3 turn cooldown instead. It also has an equipment slot for gems. The class is basically a remix of Archer and Corruptor. While the Archer talents and Corruptor talents have not been tweaked for this remix, the Debility tree starts you off by giving all your arrows a little blight damage, a chance of inflicting a disease, and 2 vim on hit.
The sad tale of my gems: The crystal race starts with a single tier 1 gem in its inventory, since you can wear 1 gem as equipment. Not thinking, I sold it at the start of my arena career and only one gem has dropped during this entire game. It was a beautiful tier 3 gem that gave me +3 to all stats, quite handy when you consider that Vectors love Dex, Mag, and Cun, as well as having a use for the other 3 stats.
Naturally, shortly after acquiring that lovely gem, I reached a point where, against an Orc Corruptor, all my other defensive skills were on cooldown and I had to consume that gem in order to use my racial heal. The orc nearly smeared me across the floor anyway, but I narrowly survived primarily due to slowing the crap out of him with 3 different spells or attacks. I'm not actually sure whether slows stack or how, but it seemed to work, I archered his face off while he was slowed.
Notable current equipment:

Assume anything not shown is either a green item that doesn't notably improve any of my important attributes, or is just a depressingly empty slot.
Debility is a really handy tree, and doesn't detract from shooting foes in the face. As for plague, skill 1 aka VD is very handy, but Scatter Shot alone has similar functionality to using Cyst Burst + Catalepsy. Scatter shot requires fewer turns, and fewer enemies are immune to it, whereas Epidemic is the only Plague skill that completely ignores undead/construct/crystal immunities. I would move the point out of Cyst Burst if I could, luckily I was able to recover the other points I had in CB and catalepsy shortly after realizing I didn't need them.
A crystal's inherently frequent teleportation helps a lot for a ranged class that doesn't have a steady supply of pets. My life is even easier when I play classes that have Thought Form or oozes or whatnot, but this race does a great job of rounding out classes that do not.
Happy to answer any questions, and highly interested in any suggestions!