The Dread Necromancer is a complete reimagining of Necromancer - while it shares many of the themes and names, and has a few talents retained, it's effectively an entirely new take on the class.
It still uses mana and souls, but souls behave quite differently. You can store up to 5, and regenerate and can retain up to 3 out of combat. Damage dealt by you and your minions grant soul fragments, and you gain a soul when you obtain a sufficient amount. Souls are used both to summon minions, and for your more powerful spells.
Depending on your categories chosen you can have powerful, temporary minions, weaker mass minions that last indefinitely in combat, or a single minion with customization options.

See the forum thread for full details.

Adds the Dark Priest, a mage subclass.

Even in an age of supposed prosperity, there are many who lose their lives in vain. Those who tend the wounded, returned home from battle or adventure, are highly skilled in the arts of healing, many using arcane techniques. But there are some who have seen too much. They have formed a brotherhood of those who have accepted the Dark Truth. Eyal has but one true God, and He demands sacrifices. The Dark Priest and his brethren tap into arcane energies to deliver the bad word unto all the people of Maj'Eyal. They manipulate darkness and life energy to convey their message of doom and despair. When that doesn't work, carrying a big stick helps, too.

Dark Priests use Magic and Cunning as their primary stats. They focus on Darkness and Arcane spells, and are proficient in staff combat, as well. They also have command of a unique kind of magic, Unhealing. Unhealing is negative healing and such functions differently than damage. It will not be affected by any type of damage mitigation and will be increased by the target's healing modifier.
(full descriptions in the forum: http://forums.te4.org/viewtopic.php?f=50&t=45460 )

Adds the Steam Witch, a Tinker sub-class. The Steam Witch was born into time magic but found the ordered ways of the Wardens boring and struck out to find a path of their own. Travelling through time and space they found an affinity for technology and integrated their time magic with steam mechanisms.

Steam Witches are a ranged attack and spell casting class. Their tl;dr description is ‘magical Psyshot’. Class highlights:

Mystic Combat: Steam Witches fight with a steamgun in one hand and a dagger in other, projecting ranged dagger attacks when attacking with the steamgun. Successful dagger attacks will trigger additional effects based on a selected Touch ability (possible magical attack, magic enhancement, or lifesteal regeneration).
Timegear: Use steam-powered devices that are infused with magical effects.
Hexes: Cast hexes on enemies to render them vulnerable to damage types. Later abilities add damage-over-time and effect vulnerabilities to hexes, plus a special attack based on the hexes a target is afflicted with.
Witchbrews: Customize your character build with one of three Brew sustains that enhance either combat, magic, or steampower.
Future Relics: Activate powerful offensive and defensive abilities that require a turn and a large amount of steam to charge up.
Time Magic: Phase away from enemies, deflect and delay damage, repair your timeline, summon a spider familiar, and create walls out of thin air! Be careful though, as Steam Witches lack the rigorous training of Chronomancers and thus do not benefit from and have less control over Paradox.
Clockwork Menagerie: Command an array of mechanical creatures just short of a winged monkey with cymbals.

• 1.2.0 Update: Extensive talent tree modifications/additions; new character creation required for talent changes.

Requires Embers of Rage to play.

Link to forum: http://forums.te4.org/viewtopic.php?f=50&t=49638
Link to Steam Workshop: https://steamcommunity.com/sharedfiles/filedetails/?id=1853297099

This adds a new Evoker class which is both corrupted and cursed (though it shows up under Defilers). They are a magic class that does blight damage and evokes a demon to serve you.

It is possible for you and your demons to help or hurt each other with some spells and skills. Learning how to work with and around your minions will be key.

NOTE: This addon requires that you have the Ashes DLC active.

https://github.com/Werekracken/tome-evoker

---Generic talents
cursed/cursed-form
cursed/diabolical
cunning/survival - locked (because everyone gets it)
cursed/cursed-aura - optional

-Cursed/Diabolical:

Demonic Pulse:
You sacrifice 10%% of your current health to send out a pulse of demonic energy in radius 10.
All minions in the pulse gain 25%% global action speed for %d turns and the pulse will attempt to daze all foes for %d turns.
You also use your knowledge of the demonic arts to passively obtain unlife, making it so that you only die when your life reaches -%d.
The amount of unlife and the chance to daze increases with your Mindpower.

Demon Portal:
You instantly swap places with your demon. This heals both of you for %d life and you gain 5 hate.
Afterwards, your demon and yourself will be out of phase for 3 turns. In this state all new negative status effects duration is reduced by %d%%, your defense is increased by %d and all your resistances by %d%%.
The amount healed and out of phase bonuses will increase with your Mindpower.

Speed Demon:
You sacrifice 10%% of your max health in return for speed and power.
While sustained you gain %d%% movement speed and increase your Mindpower by %d.
The speed bonus will increase with your Willpower.

Abyssal Shield:
Surround yourself with a defensive aura, increasing armor by %d, and inflicting %0.2f fire and %0.2f blight damage to all attacking foes.
Additionally, your vim will enhance your defences, reducing all damage by %d%% of your current vim (currently %d), but never reducing by more than half of the original damage. This will cost vim equal to 5%% of the damage blocked.
The damage will scale with your Mindpower.

---Class talents
corruption/demon-summons
corruption/sanguisuge
corruption/shadowflame
corruption/vim
cursed/darkness
cursed/fears
corruption/blood - locked
corruption/doom-covenant - locked
corruption/fearfire - locked

-Corruption/Demon Summons:

Summon Demon:
Summon a demon by sacrificing 50%% of your current health. Your demon's primary stat will be improved by %d, its two secondary stats by %d.
At talent level one, you may summon an fiery imp; at level three a shadowy dúathedlen; and at level five a grotesque uruivellas.
Summoned demons can only be maintained up to a range of %d, and will rematerialize next to you if this range is exceeded.
Only one summoned demon may be active at a time, and the stat bonuses will improve with your Spellpower.

Demon Unity:
You now gain %d%% spell speed while Summoned Demon: Imp is active, %d%% resist all while Summoned Demon: Dúathedlen is active, and %d Mindpower while Summoned Demon: Uruivellas is active.
(Takes effect upon summoning.)
These bonuses scale with your Spellpower.

Flame Fury:
You sacrifice 10%% of your current health channel the power of Fearscape that resides in your demons and a wave of fire emanates from you knocking back foes within radius %d and setting them ablaze doing %0.2f fire damage over 3 turns.
The damage will increase with your Spellpower.

Improved Summoning:
Your summoned demons are more powerful and know new talents at talent level %d.
Imp: Flame Shock, Firestorm, and Burning Hex.
Dúathedlen: Shadow Combat, Shadow Grasp, and Shadow Veil.
Uruivellas: Rush, Draining Assault, and Blindside.
As your Improved Summoning talent increases, so do the chances of your demons being summoned with improved gear (ego chance).

---Changelog
v1.0.0
Initial release

v1.1.0
Took out Demonic Possession and added Demonic Pulse. Moved Improved Summoning to the 4th talent to be the capstone. Cut total hate pool down to 25. Added a hate cost to Demonic Pulse and to the Summon Demon sustains. Reduced max_life from 110 to 90. Improved class description.

v1.2.0
New cursed/diabolical generic tree that replaces cursed/dark-sustenance. Moved Demonic Pulse to Diabolical tree and replaced it with Flame Fury. Made demon kills grant the player 1/4 of the hate for the kill. Changed Duathedlen skills to take out stealth. Added more sacrifice health costs to skills.

v1.2.1
Fixed typos. Reduced sustain hate cost on demons and added a hate gain to Demon Portal to address resource starvation on tough single target fights. Changed the range on Demon Portal to scale with talent points. Tweaked the talent icon for Speed Demon.

v1.2.2
Fixed some talent descriptions.

v1.2.3
Gave Imp and Wretch movement talents. Fixed demon equipment so they don't spawn with antimagic items. Toned down demon chance to get egos on equipment, made level in Improved Summoning increase the chance.

v1.2.4
Reduced pre-req for Blighted Summoning to apply to demons. Fixed imp sometimes missing equipment. Fixed ego chances for demon equipment. Increased imp defense. Gave dúathedlen a regen talent. Added out-of-phase to Demon Portal. Set demon speed equal to yours. Took out some preset talent points to let you spend them as you want. Made Evoker life rating equal to the highest mage (alchemist). Balanced imp phase door. Some hate balancing.

v1.2.5
This is an overhaul of the class because it didn't feel as good to play and balanced as I wanted it to.
- Increased max hate a little. It's still a small pool, but doesn't feel as punishing.
- Increased the level and stat requirements across the board for the Diabolical and Demon Summons trees. Now new demons and levels in Improved Summoming feel special.
- Took out both shadows trees and Black Magic. Added Darkness, Vim, and Doom Covenant (locked) trees. Locked Fearfire. Took out Torment so that you have to wait to use higher vim cost skill until you have more vim in your pool, or use your life with Bloodcasting.
- Made demon summons immune to fear and tweaked their life, armor, and defense to give them a bit more survivability.
- Changed demon summons to start off tiny and grow as you level which is fun with Nekarcos's Visible Size Categories. Without Nekarcos's addon the dúathedlen and uruivellas will be graphically very large even if their size=tiny.
- Changed the Imp's Improved Summoning skills.
- Toned down Improved Summoning so that demons only get one skill with the 1st point, improve that skill with the 2nd, get a second skill and improve the first skill with the 3rd point, improve them both with the 4th point, and get a third skill and improve the previous two skills with the 5th point.
- Changed the wretch to an uruivellas (minotaur-like demon) and gave it a 2Her to help differentiate it from the dúathedlen (shadow demon).
- Fixed the dúathedlen image.

The Witherer is a Corruptor that focusses on slowly killing their enemies.

One year has passed since the one the Orcs call the "Scourge from the West" came and single-handedly crushed the Orc Prides of Grushnak, Vor, Gorbat, and Rak'Shor.  The Allied Kingdoms, now linked by farportal to their distant, long-lost Sunwall allies, have helped them conquer most of Var'Eyal.  The few remnants of the ravaged Prides are caged...  but one Pride remains.  Kruk Pride, isolated on an island, is the last orcish settlement that stands; they, too, face their impending doom.  The Sunwall has blockaded the only exit point from the island, and now, the technologically advanced civilization of Steam Giants have come down from the mountains to take their homeland with machines and weaponry unlike anything else on Eyal.  Kruk Pride has reverse-engineered their technology before; their only hope is to do it again and rise up against the Pride's foes.
 

Features:

• Explore a whole new campaign from level 1 to 50, one year after the events of the original Tales of Maj'Eyal campaign. Liberate the Orcs (or die trying) by rising up against the Sunwall, the Steam Giants of Atmos, and other dangers that may lie in wait...
• Play as one of three new races: the battle-hardened Orcs, the brutal Yetis, and the unstoppable Whitehooves. Discover their stories, their pains, their hopes... and their awesome racial powers!
• Risk your life in over 20 unique zones! Explore the ruins of a lost city, lay siege to the Sunwall forces at the Gates of Morning, and raid the Steam Giants' mining quarry - each has its own unique foes and hazards, leading each to feel and play different from the others.
• Play as one of the four new tinker classes: Gunslingers, Sawbutchers, Psyshots and Annihilators! Plus a class evolution: Technomancers! Crush and rend your foes with heavy metal, electrocute and immolate them with your gadgets, charge across the battlefield or nimbly strafe in style - each plays differently, and none provide any shortage of ways to slay your foes.
• Master steam technology to build powerful tinkers to augment your equipment. Need to close in a bit quicker? Turn your boots into rocket boots! Having a hard time deciding whether to shoot someone or stab them? Build a Hand Cannon into your gloves, or deploy a Weapon Automaton to do the stabbing for you! If you have a problem, steamtech has a solution, usually involving explosions; with over 80 different powerful contraptions to craft, enjoy unparalleled versatility and trying something different with every playthrough.
• Master the tactical uses of over 140 talents! Fire bouncing trick-shots and psychic-infused shots, use your steamsaws as shields or wheels, terrify your foes with long mechanical arms - there are no "boring" talents here, everything has its own special applications and properties!
• Use advanced technology in the world of Eyal! Burrow through sand, plant bombs to destroy tunnels, and discover that you aren't alone in using it...
• Infusions and runes are for puny humans; implant new medical injectors to pump an array of experimental chemicals into your body! Injectors can use any (infinitely reusable) salve in your inventory as long as they're off their cooldown, giving you versatility you've wished you could get with a couple of inscriptions.
• Loot over 70 new and powerful artifacts. Pump lead into foes with big guns, quick guns, and explosive guns! Shred them with saws that maim, saws that thirst for blood, and saws that aren't really saws! Violate common sense by strapping a rocket to your back and calling it a jetpack!
• Enjoy dying in horrible and exotic ways at the hands (or claws, jaws, guns...) of over 140 new creatures! Not mere piles of stats and chain-stuns, these foes will provide unique challenges - suffer the Sunwall's newest cosmic spells, the new breeds of ritches that infest and multiply, the Steam Giants' elaborate defense systems, and find new strategies to adapt to each!
• Earn a trunkload of achievements! Have your accomplishments recognized for liberating the Orcish people, displaying exceptional mercy or cruelty, or showing your prowess with impressive feats! Give a boss a fate worse than death, show Sunwall forces how frustrating it is to fight a Radiant Horror as a paladin, come out on top against impossible odds, display a suicidal lack of situational awareness, and wear a badge of pride or shame for each!
• Read roughly 27,000 words of new lore to immerse yourself in the world! Learn how things have changed since the Scourge's campaign, feel hatred and/or pity for your foes, uncover grand schemes and sinister plots, and notice the elaborate connections between Var'Eyal's numerous factions. Every zone has a story behind it, and every story ties into a bigger picture; enjoy a tale of horror and humor, of intrigue and glory, of despair and hope.
• Earn the right to use the classic (and Ashes of Urh'Rok) classes in Embers of Rage, and the new tinker classes in Maj'Eyal! Play a Brawler in the East to fulfill your life-long dream of suplexing an entire nation of giants, or play a Sawbutcher in Maj'Eyal to shred through Dreadfell in a whirlwind of sawblades and steam!

Adds the mentalist class.

Mentalists are psionics that specialize in manipulating the mind of their foes.
They can mostly deal short range damage, but they are highly resistant and resilient to effects. More they are very effective at applying debuffs to their foes and have mastered the use of mind control, psychoanalysis, mass manipulation, propaganda, hypnosis, ventriloquy and even gold to create confusion, weakness, demoralization, betrayal and subversion among their foes.
They wear mindstars that they handle directly with their mind.

Many in Maj'Eyal have heard of "demons", sadistic creatures who appear seemingly from nowhere, leaving a trail of suffering and destruction whereever they go. Their Fearscape floats far above the skies, watching and waiting, but not idly; their agents scout the land, their legions build up their forces, and their scholars develop new spells and strategies. As the barrier between our worlds begins to crack under their scrutiny, helpless Eyalites have begun to disappear, whisked up to serve as their slaves and playthings. They imbue these victims with magical powers to better survive the ensuing stresses - can you use your new-found abilities to escape the legions of Mal'Rok?

Features:

• Start with a new class, the Doombringer! These avatars of demonic destruction charge into battle with massive two-handed weapons, cutting swaths of firey devastation through hordes of opponents. Armed with flame magic and demonic strength, they delight in fighting against overwhelming odds, softening up the crowd with waves of fire, then feeding on the flames and suffering of their surroundings to stay alive while quickly reducing any group to a pile of ash and gore.
• Unlock a new class, the Demonologist, with an all-new item enhancement mechanic! Bearing a shield and the magic of the Spellblaze itself, these melee-fighting casters can grow demonic seeds from their fallen enemies. Imbue these seeds onto your items to gain a wide array of new talents and passive benefits, and summon the demons within them to fight on your side! Ever looked at a gigantic demon-cursed minotaur and wished it was on your side for once? Well, now you CAN summon one to pound your foes into paste while you cast devastating spells from afar, or call forth a squad of Fire Imps to pelt your enemies to death while they exhaust themselves on your impenetrable defenses! Demons have persistent health, making them a little more precious than disposable necromancer skeletons or summoner beasts, but can be revived from death nonetheless.
• Two new zones, with all-new art, foes, and bosses! You've seen the plains of the Fearscape before, now see the lairs and headquarters of the demons themselves!
• Over 10,000 words of written lore to find! The demons were once an enlightened, peaceful race, hailing from a distant planet known as Mal'Rok; learn what drove them to plot Eyal's eternal torture! Discover monuments to each of the demonic species and noteworthy individuals, showing the place of honor each has among them! Get a glimpse into the culture and daily lives of these sadistic invaders and their brainwashed thralls!
• Unlock a new race, Doomelves: Shalore who've taken to the demonic alterations especially well, corrupting their typical abilities into a darker form. Blink away to safety, transform into a shadowy dúathedlen to hide in the shadows or prey on your foes with blasts of darkness, use your new resilience to soak up status effects and critical hits, and assault your enemies' minds to leave them unsteady in combat!
• Between the aforementioned classes and Doomelves, a whopping 75 new talents!
• Unlock two new cosmetic options! You know you've always wanted demon-horns.
• Two new events, appearing anywhere in Eyal!
• 20 new artifacts, with unique and interesting effects. Collect the Obsidian Treasures to amass more and more power! Slip your hands into the Will of Ul'Gruth and watch your sweeping blows smash down walls! Wear a giant hideous hell-mouth as a fashionable belt!
• 7 new achievements! Conquer the worst Urh'Rok's forces can throw at you, and hang their metaphorical skulls from your profile page!

Not all adventurers seek fortune, not all that defend the world have good deeds in mind.
Lately the number of sightings of horrors have grown tremendously. People wander off the beaten paths only to be found years later, horribly mutated and partly insane, if they are found at all. It is becoming evident something is stirring deep below Maj'Eyal.
That something is you.

Forbidden Cults is a big expansion for Tales of Maj'Eyal to let you explore the horrors that lurk beneath the surface, to delve in long lost knowledge and lore and as usual to die a lot!

Forbidden Cults makes two new classes available to play:

• Writhing One: Give in to the corrupting forces and turn yourself gradually into an horror, summon horrors to do your bidding, shed your skin and melt your face to assault your foes. With your arm already turned into a tentacle, what creature can stop you?
• Cultist of Entropy: Using its insanity and control of entropic forces to unravel the normal laws of physic this caster class can turn healing into attacks and call upon the forces of the void to reduce its foes to dust.

Both those classes use a new resource called Insanity that gradually makes you both more chaotic and powerful as it fills up.

Forbidden Cults makes two new races available to play:

• Drem: A corrupt subrace of dwarves, that somehow managed to keep a shred of sanity to not fully devolve into mindless horrors. They can enter a frenzy and even learn to summon horrors.
• Krog: Ogres transformed by the very thing that should kill them. Their powerful attacks can stun their foes and they are so strong they can dual wield any one handed weapons.

Forbidden Cults adds many new zones for you to explore and die in:

• Kroshkkur: An ancient Sher'tul Fortress laying half in ruins that serves as a focal point, and home, for all kinds of creatures seeking lost knowledge.
• The Maggot: A huge living corrupted worm about to destroy Kroshkkur! Teleport inside and save your sanctuary of horrors!
• The Godfeaster: Deep undergroud the ground shakes as ... -- redacted by corrupt forces --
• The Scourge Pits: On the south of the Iron Throne lays a fool pit of ... -- redacted by corrupt forces --
• Forbidden Tomes: Find special artifact books of ancient lore. But, read at your own peril, for the story they tell may very well suck you in... quite literally.
  Maybe you will even find The One That Writes...
• Occult Egress: A strange, extremely old, contraption of unknown origin. It seems to require some kind of code sequence to activate. Maybe you will find some during your adventures?
• The Entropic Void: So you think you are strong? Powerful? Invulnerable? In the end, entropy always wins, as you will learn...

What would an expansion about horrors be without a bunch of new horrors to torment you with? Please give a warm welcome to:

• Searing Horrors: You liked luminous horrors? You loved radiant horrors? You will absolutely adore their searing big brothers!
• Nethergates: It sleeps. Maybe it should stay that way.
• Netherworms: Vampiric worm masses that are bound to tickle your fancy! And tickle hard.
• Fearful Symmetry: Geometry has never been so lively!
• Entropic Shards: Take an entropic crystal, shatter it with tentacles. And die.
• : And more ...

"DarkGod, is that all?" Obviously not! You will also find your usual addition of:

• Lore: Delve into the dark forgotten secrets of the world, where sanity is a very tenuous idea.
• Artifacts: Discover new objects of power and use them to further your own goals.
• New wyrmic tree: Unlock the scourge drake for your wyrmics.
• Glass Golem: Unlock the glass golem option for your alchemists.
• Events: Discover new strange contraptions in familiar zones. What could go wrong?
• Achievements: Because there can never be enough!