So I'm nearly finished with the Scourge race - some combat logs from arena testing - I first had a squad of skeletals, consisting of 4 skeletal mages armed with quarterstaffs, several regular skeletons, 2 liches and a bone wraith armed with a steel axe, versus some miscellaneous races; I then did one with a blight aberration (the Grobbulus-style flesh giants - the WotLK ones are simply called "flesh giants"), some plague eruptors (the big, hulking mutant zombies from WotLK) and several unarmed plague cultists (they're one of the regular cultist castes - they'll have some innate biomancy-related abilities). Turned quite brutal, as you can see.
Right now they're very bare-bones, as I'm still ironing out some issues - they will have full interactions, syndrome-causing fluids and all that once I'm done, though. Shades caused me a bit of a problem, as at first they only dented the skin and nothing else - as they're incorporeal, they'd mostly attack with edged attacks, like the ethereals. My current workaround for it is to have them made out of mist and energy - the mist is the stand-in for the wrappings, since I figured "tearing the mist" doesn't sound that weird. I'll try to find a better way to go about it eventually.
In any case, the full list of castes right now is as follows:
-Humanoids
-the Damned - only mortal caste, supposed to serve as the "basic" cannon-fodder caste.
-Unholy Cultists - the necromancers - they'll have atleast one curse type, and several different types of raise dead-esque interactions.
-Plague Cultists - similar to the above, only they'll have biomancy-related spells, mostly for debilitating enemies and causing infections.
-Plague Eruptors - large, mutated zombies - they'll have some types of toxic breath attacks that cause syndromes, potentially one that induces a form of zombification. Also their bites would cause the same syndromes.
-Darkfallen - vampiric, undead elves - I haven't decided yet what abilities they'll have besides being able to suck blood.
-Crypt Fiend - undead nerubians - will have the same web-shooting ability.
-Crypt Lord - undead spiderlords - again, similar to their living versions, aside from undeath benefits.
-Vargul - undead vrykul - will have higher learning rates for weapons, like their living counterparts.
-Constructs (all are counted as "male" for description purposes - logically they should be genderless though)
-Flesh Giant - same size as Sea Giants, will have higher learning rates for metalsmithing-related skills.
-Flesh Titan - same size as vanilla Giants, will have some electricity related abilities. Also have metal plates around some parts of their body that can potentially block damage.
-Flesh Beast (based off of Festergut and Rotface) - smallest type of construct, although still very large - they'll have several gas and sludge breath attacks that will cause syndromes. Also have lots of redundant limbs that, while not usable for attacking, will most likely absorb some blows from AI-controlled creatures. On top of that, since they have eyes, well, everywhere, blinding them non-magically isn't really an option.
-Blight Aberration (the aforementioned Grobbulus-esque construct type) - bigger than the Flesh Beast but smaller than the Giant. They have a different body plan, with their upper halves being regular flesh-and-blood, but their legs and lower bodies are metal and bone, making them more difficult to cripple - some of their other body parts are also reinforced by metal. They also have two attachments - a syringe and a hammer - the hammer allows for a stronger melee attack, whereas the syringe will be used to inject syndrome-causing ooze; on top of that, they have a tank of ooze on their lower bodies and several tubes, that can cause rapid bleeding out if damaged. Lastly, they cannot be blinded, as they lack eyes completely.
-Incorporeals (Banshees and Spectres technically are normal flesh-and-blood while alive - as I've mentioned, I'm not sure if they're supposed to be fully incorporeal or only corporeal until they are killed)
-Banshees - same as Forsaken Banshees, more or less.
-Spectre - male equivalent to the Banshees, they'll have more curse-related abilities in place of the sonic wave projectile and fear-inducing scream.
-Shade - fully incorporeal - they can fly, and can avoid traps, but will also quickly flee fights - I'll give them some temporary blinding ability for when they try to flee, perhaps some debilitating curses as well.
-Val'kyr - sort of a mix of both - they have metal armor covering most of their body, but beneath that they're incorporeal - they have some blunt attacks, and also some edged attacks more similar to the likes of shades and ethereals. They'll also have an interaction that lets them resurrect other types of scourge undead.
-Skeletals (again, except for the Liches they should most likely be genderless - mages and regular skeletons have male and female versions, bone wraiths are male only)
-Regular Skeletons - made entirely out of bone - don't feel fear, pain and cannot be stunned, as you'd expect.
-Skeleton Mage - will have some types of magic - not sure what yet. Will be slightly easier to kill than regular skeletons due to having soul gems in their chests.
-Lich - will have frost and necromantic magic - they can fly as they're only a torso. Males also have tusks and horns that the females lack.
-Bone Wraith - four-headed, winged, floating torsos - they'll be the "physical fighter" equivalent to the liches, having higher weapon skill learning rates.
I'm also thinking of adding a "Lich King" caste that would serve as the leader of the undead civs, and possess several powerful abilities - I'll toy with the idea a bit.