This addon adds in a Faerie, or Fey, race into ToME. This addon was originally created by Kaballah, but he hasn't been online in over a year.
Instead of letting it die (I mean, how could we not be able to play as a Faerie?) I decided to fork it over into a playable form.
I've taken it, modified it's values, and changed it's 4th talent.
You can nab it here.

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The Fey are an incredibly quick and agile race, however they are incredibly fragile.
You will have to make use of their blinding speed to survive encounters.
If you find yourself in trouble, you can spray some Fey Dust onto nearby enemies while you escape.

Fey stats:
-2 Strength, -5 Constitution, +3 Dexterity, +3 Cunning, +6 Luck,
Life per level: 7
Experience bonus: 5%
Unbreathing

Fey skills:

-Flight
--Passive
--The Fey are capable of flight.
--Avoid certain traps
--Grants bonus Movespeed and Defense, that scales with Dexterity or Magic
--Effect grows if health is low
--Pretty magical wings

-Fey Luck
--Passive
--The Fey are naturally lucky, and this aids them in many ways.
--Grants Luck and Saves
--If you take more than 10% of your life in damage, some of the damage is nullified, and you gain a shield of equal value.
--Scales with Luck
--Effect grows if health is low

-Fey Speed
--Active
--The Fey are always fleet-footed, and are ready to split upon a moment's notice
--Grants bonus Global Speed that scales with Dexterity or Magic
--Effect grows if health is low when activated
--Removes all Pinning effects

-Fey Dust
--Active
--The Fey's Dust, while pretty, turns out to not feel good when thrown into eyes
--Sprays a cone of Fey Dust, which deals damage that scales with Dexterity or Magic
--The spray also knocks back and blinds enemies hit
--It can also stun or confuse, if used at low health

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Dark Faeries are Faeries that have given up much of their natural agility and defense in exchange for bonus offensive potency.
They are extremely frail, even more so than their more agile counterparts, but make up for it with faster offense, higher damage, and many different tricks.
Despite all thoughts otherwise, they are still, mostly, a playful bunch to be around, if not a bit more painful in their method of invitation.

Dark Fey stats:
-3 Strength, -7 Constitution, +3 Dexterity, +3 Magic, +1 Cunning, +6 Luck,
Life per level: 5
Experience penalty: 5%
Unbreathing

Dark Fey skills:

-Powers of the Dark
--Passive
--The Dark Fey have sacrificed their Flight for additional offensive potency.
--Grants bonus Cast Speed and Combat Speed, that scales with Dexterity or Magic
--Grants bonus Damage that scales with Luck and Character Level
--Effect grows if health is low

-Fey Clone
--Passive
--The Dark Fey have given up some of their natural luckiness, but not all.
--Grants Luck and Saves
--Upon dealing damage, you summon a clone of yourself for a few turns.
--Has your entire talent list, deals 50% damage, and has 10% of your max life.

-Vision of the Shadows
--Active
--The Dark Faerie has lost it's ability to flee, and has been forced to find other methods of survival, in the form of dark magics.
--This talent shows all enemies within a moderate to large radius around yourself.
--Calls forth 3 shadows onto nearby enemies that are in sight.
--Shadows are extremely weak, but make for decent body-blockers.
--Vision Radius, Vision Duration, and Number of Shadow Targets increases with talent level.

-Feyd to Black
--Active
--Call forth the powers of darkness to overflow the battlefield, affecting all Actors in sight range.
--Increase all allies life by a percent of their Max Life. (Including yourself.)
--Decreases all foes life by a percent of their Max Life.
--Blind all foes, even those who cannot normally be blinded.
--This effect's power increases as your life decreases.
--This talent does not proc healing effects, and cannot lower enemies below 10% of their max health.

Modifies the character creation dialog to bypass the lock check for races and classes, allowing characters to be created using locked races and classes. Doesn't actually unlock anything.

Frequently Asked Questions:

• Hey, the character creation dialog still says I have locked races/classes! What gives?
• Will this prevent me from unlocking things?
• The latest version of the game has a new locked race/class. Will I need a new version of this addon to access it?
• What the heck is this Runic Golem thing?

[License note: This addon uses a modified version of an image by Lorc from Game-icons.net, pursuant to the Creative Commons CC-BY-3.0 license.]

The current version of the empyreal class. See the forum post for more info.

Adds the Mage Knight metaclass, and its six sub-classes.

Forum discussion thread: http://forums.te4.org/viewtopic.php?f=50&t=48329

Phoenix Knight: Powerful warriors who blast their foes with solar fire while calling healing light upon their allies. Their solar fire attacks will strike as either fire or light damage, whichever will hit their target the hardest, and their potent healing and cleansing abilities make them tough opponents to bring down.

Mind Knight: Psionic warriors who strengthen their mental abilities by tapping into their inner magic. Adept at telekinesis, telepathy, and teleportation, they are mobile scouts who can quickly get a lay of the land and sow chaos among their foes with physical and mental debilitations, or even outright compulsions.

Storm Knight: Swift skirmishers who rely on extreme mobility and powerful lightning magic to strike their foes down and avoid reprisals. Extremely fast and difficult to pin down, they can cast entire enemy units into disarray with their wealth of area attacks. All mage knights can cast while they fight, but experienced storm knights are also able to fight while they move.

Earth Knight: The heaviest of infantry, earth knights hammer their foes with physical and natural forces while shielding themselves with the power of the earth. Highly resilient in the face of any attack, earth knights provide a slow and steady offense supported by powerful gemstone shields and the endurance of a living mountain.

Sea Knight: Healers first, fighters second, battle mages a somewhat distant third, while sea knights lack the raw offensive power of other mage knights, they make up for it with amazing personal defense and recovery abilities. And though their attacks may be individually weak, like the sea itself, they are able to wear down even the strongest defenses eventually, eroding their opponents away with gradually strengthening spells, making them terrors in a battle of attrition.

Mana Knight: Experimenting pioneers who do amazing things with raw magical energy. They have the most conventional magical training of the mage knights, even if they sometimes put it to unconventional use. Their arcane attacks can overwhelm the powers of other spellcasters, and while they lack the scope of power of full-fledged archmages, they are masters of the fundamentals of the various arcane schools.

"Celestial Avatars are the representation of the heavenly bodies summoned by Anorithils to help in the defense the Gates of Morning.
Because they are summoned by Anothirils they can control negative energy and positive energy at will, and their their body will react to the manipulation of these energies.
They use negative energy to blast their enemies with dark spells or they use the positive energy to attack enemies with weapons.
Their most important stats are Strength and Dexterity if they walk along the path of the sun or Magic and Cunning if they walk through the path of the moon."

Adds many new spells for Necromancer and modifies many existing spells, effects and minions. See thread for full details.

Adds Beholders as a playable race. Created by ajfluffy (design, code and conception) and rexorcorum (ideas and artwork), this addon is now being maintained by Nagyhal under the guidance of rexorcorum in ajfluffy's absence.

Edit: Had to change the addon's short_name, and so v1.0.6's automatic upload helpfully made us a completely new addon page. Of course it's all on Steam, which is beautiful (thank you DG!), but I'm hoping we can merge the older versions into this thread. We'll look at it tomorrow.

Edit of the edit: In the meantime, players who have fallen afoul of my clumsy Flame Laser bug are encouraged to upgrade to v5.9.2 for compatibility reasons. Have fun and happy facemelting!