While I do consider the Illidari as their own unique race to the others, I do have some headcanons for the forces as a whole so let's get right into them.
The main faction is called Finel-Aegiess, which means in Darnassian "The Last Protectors".
The Ritual of becoming a Demon Hunter has no variations within the faction as it still requires the preformer to have nothing but their life to loose.
Once someone has successfully become a Demon Hunter they are treated as a family member with squad members treating each other as siblings with the squad leader seen as a parent/oldest sibling, companies acting as tribes and chapters seen as clans.
After Illidan anointed The Slayer as the supreme leader of the Finel-Aegiess, they promoted 5 of their greatest champions into leadership positions where they each lead a multitude of chapters which they called (much to the shagrin of everyone) Legions.
There are a total of 5 Finel-Aegiess Legions with The Slayer only having a Chapters-worth of forces made up of the best of the best at their command.
The Finel-Aegiess Legions names are called; The Sentinels Ascendant (Lead by Altruis), The Noble Exemplars (Lead by Kayn), The Immortal Vipers (Lead by Lady S'theno), The The Tormentors Imperius (Lead by Akama) and The Prophets of Penace (Lead by Matron Mother Malevolence). The Slayer's Elite Chapter is called The Omega Hunters.
Each legion of Finel-Aegiess has around 10,000 to 250,000 members, a single Chapter has at the very least 1,000 members, a Company roughly has 100 members and a squad has about 10 members.
Most of the races that has joined the Finel-Aegiess has brought with them a new Metamorphosis.
After reorganizing Finel-Aegiess into what it is now, The Slayer had their forces retake their former bases of operation.
Elves are the most numerous of Finel-Aegiess with members of each breed of Elf within the faction and every Elf that becomes a Demon Hunter is called an Illidari.
Each of the forms the Elves brought are as follows; Night Elves with Havoc, Nightborne with Analyst (Inquisitor look with Ranged Support), High Elves with Seekers (Darkglare/Observer Look with Magical Ranged DPS), Blood Elves with Vengence and Void Elves with Swarm (Imp look with Melee Support).
Most of the Veteran Hunters are Night and Blood Elves, it should also be noted that Veteran Hunters are called Scar Hunters and are seen as Grandparent to younger Demon Hunters.
The Illidari used to have a view that all non Illidari were lesser, but thanks to the efforts of The Slayer and Altruis that view changed.
Satyrs, like all demons, did not bring a new form/ability for Metamorphosis but they instead brought with them various new druidic skills and a way to travel through the emerald dream/nightmare.
Common roles the Satyr are; Scouts & Front-Line Infantry.
Not many Night Elf Illidari enjoy being around Satyrs due to their history, but thanks to the efforts of Altruis that is slowly changing.
The sects that have joined Finel-Aegiess are; Haldarr, Legashi, Nethervine, Sargeron & Shadowhoof.
The Naga brought with them the ability to make one's Metamorphosis aquatic, which adds to the Metamorphosis; Webbed feet and hands, gills and fins.
The roles of the various Naga remain the same within Finel-Aegiess.
Very few of the Naga apart of Finel-Aegiess have actually gone through the ritual to transfrom into a breed of Naga above their original form.
The Naga of Finel-Aegiess do infact have a Hierarch Naga that is not Azshara.
While the Fal'dorei did not bring anything new to the Metamorphosis they do provide a very important role within Finel-Aegiess, they use their silk to make clothes, bedding, bandages and other such things.
Because of their invaluability almost all Fal'dorei remain at the bases as medics & emotional support, it's quite common for squads to call their assigned Fal'dorei Mother or Father.
Most Fal'dorei that act in a combat role are usally Spellbreakers with a bow and arrows.
The Felbood Elves that have joined Finel-Aegiess brought with them the ability to give wings to any of the Metamorphosis forms, this has proven to be invaluable.
Thanks to the community that is Finel-Aegiess every Blood elf & Felblood elf no longer have a mana addiction, how this was done is unknown to all outsiders and while Finel-Aegiess have tried to tell the rest of Blood elf kind they do not listen due to the fact that they have a new sunwell.
The intagration of Felbood elves into Finel-Aegiess was suprisingly easy, as most of them had worked with demons and fel-fueled technologies before.
The San'layn brought with them necromantic magic with them, this has proven useful as it is easier to raise the head of a demon than taking a whole demon alive for questioning.
Due to the above mention skill most San'layn have the role of interrogators and information gatherers.
Due to the fact that San'layn are a rare form of undead (in that their entire body is revived to the point that they can be seen as alive), they can become Illidari unlike other undead who would mearly become the host body to the demon.
Orcs that become Demon Hunters are called Dae'gora, which means Twisted Gorer and they are called this as they gore the twisted demons.
Both regular Orcs and Mag'har brought with them the Chaos Metamorphosis (Felstalker look with mix magical combat).
Most of the Orc's relate to which clan they come from, as such many different role end up being filled by Orcs.
The clans within Finel-Aegiess that are regular and Mag'har Orcs are; Blackrock, Burning Blade, Frostwolf, Rageroar and Thunderlord.
Due to the Fel Orc's intensity, they brought with them the Calamity Metamorphosis (Shivarra Look with Melee DPS Tank).
Since the defeat of Illidan at the Black Temple, the Fel Horde exiled the Bonechewer clan and the Burning Blade & Thunderlord clans left to become regular Orcs once more.
The clans still apart of the Fel Horde are; Bleeding Hollow, Dragonmaw, Laughing Skull, Shattered Hand & Shadowmoon.
The name for a Demon Hunter Eredar is Ered'eesh which translates as "Butcher of Corruption".
While the Eredar did not bring anything for the Metamorphosis' they bring invaluable skills, shuch as their artificers knowledge of the Legions technologies.
The only Eredar that cannot become Demon Hunters are; Wrathguards, Brutes, Doommaidens Destroyers, Ur'zul, Lightforged & Voidscarred, this is because their bodies are too infused with Fel/Light/Void.
While Akama originally did not trust the Slayer and their Illidari, he was able to grow a kinship with them thanks to the efforts of Altruis (the two of them are now best friends).
The tribes of Lost Ones & Broken that are apart of Finel-Aegiess are as Follows; Umbrafen & Tuurem for the Lost Ones & Ashtongue, Greyheart & Murkblood for Broken.
As mentioned before the Sentinels Ascendant Legion is led by Altruis.
The Sentinels are stationed at Hellfire Citadel, their duties there is to mantain control and peace at Hellfire Peninsula, ensure the Fel Horde doesn't try to take over Outland or invade Azeroth and guard the Dark Portal.
The Races that make up the bulk of the Sentinels are; Night Elves, Satyrs, Nightborne, Orcs, Fel Orcs, Ered'ruin, Annihilan & Overfiends.
The Sentinels Ascendant Legion has 7 Chapters with 54 Companies in total, the Chapter are known as; The Jade Interceptors, The Brazen Valedictors, The Wardens Infernus, The Horned Sabres, Justicars Unchained, The Ashen Brotherhood & The Gilded Vipers.
The Sentinels are commonly the ones to try and keep the other Legions from attacking each other.
As stated before the Noble Exemplars Legion is Led by Kayn Sunfury.
The Exemplars are stationed at Tempest keep, their duties include maintaing control and peace in Netherstorm, keeping watch over the Felsworn of the territory and keeping guard of Finel-Aegiess' worst enemies that have been captured.
The Bulkward of the Exemplars is made up of; Blood Elves, High Elves, Felblood Elves, Void Elves, San'layn, Nathrezim, Inquisitors & Jailers.
The Noble Exemplars Legion had originally 22 Chapters with 189 Companies total, but due to a heavy attack from the Felsworn they now only have 8 Chapters with 49 Companies in total and the Chapters are; The Ebon Reapers, The Chorus of Penitence, The Obsidian Arrows, The Black Blades, The Onyx Scorpions, The Necropolis Scimitars, The Shrouded Templars & The Hallowed Mortifactors.
The Exemplars share a rivalry with the Sentinels Ascendant in a similar fashion to the rivalry of Altruis and Kayn.
The Immortal Vipers are led by Lady S'theno as mentioned before.
The Base of operation for the Vipers is Coilfang Resevoir, their duties are maintaing Peace and Stability in Zangramarsh, ensureing there is enough water for all of Outland & acting as a neutral zone for the Horde and Alliance.
The Immortal Vipers are mostly made up of Naga, Fal'dorei, Nightborne, Darkglares & Observers.
There are a total of 3 Chapters with 30 Companies in total, the Chapters are; The Lacerating Striders, The Serpentine Desolators & The Silver Slakers.
Lady S'theno has become a Hierarch Naga, she along with Azshara are the only ones so far.
Akama is the Leader of The The Tormentors Imperius Legion as stated before.
Their base of operation is the Black Temple, their duties are Watching over Shadowmoon valley, Protecting the Netherwing Dragonflight's hatcheries & acting as both rehabilitators & retirement centre.
The Tormentors Are mostly made up of Broken, Lost Ones, Draenei, Man'ari, Lightforged, Night Elves, Satyr, Fal'dorei, Mo'arg, High Elves & Void Elves.
The Tormentors have 13 Chapters and 137 Companies, the Chapters are; The Reclaimers Unyielding, The Honoured Destroyers, The Radiant Phalanx, The Gilded Swords, The Fists Vigilant, The Sentinels of Iron, The Solar Spears, The Protectors of Steel, The Solar Paragons, The Gold Wrath, The Twilight Templars, The Cardinal Crusaders & The Topaz Adders.
Most, if not all members of the Tormentors are Scar Hunters, with new members commonly being Scar Hunters from other Legions being transfered as to better rest themselves.
Matron Mother Malevolence is the Leader of The Prophets of Penace Legion as mentioned.
The Prophets base of Operation is Blade's Edge Mountains, their duties there are to mantain control and peace, train new recuits & send members to other worlds for their missions.
The Bulkward of the Prophets is made up of; Shivarra, Sayaadi, Nathrezim, Aranasi, Night Elves & Nightborne.
There are only 2 Chapters within The Prophets of Penace Legion with 20 Companies, the Chapters are known as; The Golden Visionaries & The Oracles of Fire.
Many of the Demons within this Legion have been known to cause self-harm on themselves out of a deep regret for working with the Burning Legion.
While Omega Hunters are noted to be the bodyguards of The Slayer and thus take orders from them, they do have a Chapter Master who more directly leads them and the Chapter Master is Aranna Starseeker.
The Fel Hammer is their base of operations, their duties are to protect The Slayer and thoses they deem, Go on missions that The Slayer has seen as too dangerous for anyone else & keep tabs on all of their Legions.
There is a least one of each race that is apart of Finel-Aegiess within the Omega Hunters.
There are 10 Companies within The Omega Hunters Legion.
Some of the more noteable members of The Omega Hunters Legion are; Shalja, Karnuk, Baduu, Vandel & Kor'vas Bloodthorn.
