Good evening, Anonymoose!
Next to voidkin, soulkin probably rates as one of the most difficult taxonomical terms to decipher. For the most part, the regnum (kingdom) and class names used in Eorzea are fairly straightforward:
Bloodborn
Seedkin: cactuars, funguars, roselings, etc.
Vilekin: chigoes, midges, yarzons, etc.
Wavekin: megalocrabs, orobons, slugs, etc.
Cloudkin: dodos, chocobos, vultures, etc.
Beastkin: Wolves, moles, rats, etc.
Scalekin: basilisks, raptors, drakes, etc.
Spoken: Ixal, kobolds, sylphs, the 5 races of Eorzea, etc.
Bloodless
Ashkin: skeletons, wights, ghosts, etc.
Soulkin: spriggans, coblyns, doblyns
Forgekin: juggernauts, mammets
Transcendents
Voidsent: ahriman, ogres, imps, etc.
Soulkin are called such by Eorzean scholars because it is believed that while these creatures once had a will of their own, they now find their souls bound to another object or being, and are essentially being controlled by the invasive secondary force.
Sorry about the brevity, but I hope that clears things up a bit!
Now, back to work I go!
