Alright, so this is two parts. A new zone, and a new class that you unlock by finishing said zone.
You should get an in-game item that explains some things.

Illusory Wood
You'll find this place a couple spaces east of Zigur. Minimum suggested level is 18.
Complete the quest inside and you'll unlock the Trickster class.

Trickster
A psionic rogue.
- Use illusory walls and decoys to distract your enemies.
- A wide variety of debuffs that confuse and distract your foes.
- Turn enemies' confusion into your own power.
- Convince your enemies that they don't see you, even as you stand in plain sight.
- Stabbing things.
The basic idea is that you throw out illusions everywhere to cover you while you stab things to death.

Feel free to offer suggestions/feedback/whatever.

Allows characters to respec anywhere in game, not just in towns. This is a direct reversion of the change made in 1.2.3 to the way it was in 1.2.2 and before.

v2.1.0 *** FOR ToME v1.2.4 ONLY ***
Determines how auto-explore and running respond to telepathy, including mouse moves. Regardless of the setting, hostiles seen via telepathy will not halt resting or the Rod of Recall, nor trigger automated talents. Unique or powerful monsters (rank > 3) will always trigger a halt to running when they are spotted via telepathy for any mode except 'Original'.

Available modes:
• 'Always Viligant' always stops running when a hostile creature is seen via telepathy.
• 'First Sighting' stops running when a hostile creature is sighted via telepathy for the first time. The creature will then be ignored by auto-explore until spotted by actual sight, which will trigger a halt as normal.
• 'Reset on Rest' is the same as First Sighting, but resting will forget all creatures spotted via telepathy so that they will trigger a stop again.
• 'Original' is standard ToME auto-explore behavior, which ignores telepathy when running or auto-exploring.

Also utilizes C. Lowe/CaptainTrip's 'Rest Tweaks' addon code and updates it to 1.1.5.
• Checks for and waits on any rechargeable items.
• Checks for and reloads any ammo in offhand quiver.
• Waits for cooldowns of talents set to auto-use.
• Waits for depleted air to replenish.
• Combines all checks into a single instance of rest, rather than having cooldowns etc. require a second resting phase.

Additional features:
• Fixes a ToME bug that can cause autoexplore or running to move only a single square and hang if used immediately after killing an enemy.
• Lore discovery will only stop autoexplore if it triggers a popup.
• Autoexplore will ignore Exploratory/Infinite Farportal return portals until the entire level has been explored.
• Ignores special terrain features such as Font of Healing after they are first discovered.
• Ignores open chests and alt Maze floor cracks.
• Rest and AE ask for confirmation if you have an escort in your party.
• Ignore already activated pedestals.

+ Compatible with ToME v1.2.4

Notes:
• Telepathy will not prevent auto-exploring the way normal sight will. If a halt is triggered by telepathy, hitting auto-explore again will move you at least one more square in the direction of the auto-explore path. If in 'Always Viligant' mode and a hostile is within telepathic sight (but not normal sight), you will auto-explore in 1 square per keypress increments.
• 'First Sighting' and 'Reset on Rest' modes are intended to keep auto-explore a fast process. If you spot an enemy you wouldn't mind bumping into around a corner, you can just hit auto-explore again and that enemy will be ignored until seen by normal sight. 'Reset on Rest' can be handy if you spot a type of enemy you want to be cautious around or a packed room. You can move away, rest, then explore the rest of the level without worrying about running into the middle of that room.

Version 3.0: Compatible with ToME 1.5.0

This addon supports game play for character levels higher than 50, primarily for the infinite dungeon (I.D.). This implements a number of subtle changes, rescaling game mechanics and balance for character levels above 50 in the Maj'Eyal, Infinite, and Arena campaigns for ToME. The intent is to make it possible (though certainly not easy) to reach level 500 of the Infinite Dungeon. This is not a nerf or a buff to game difficulty per se, but, rather, an extension of the well-balanced game play from the Maj'Eyal campaign to higher levels.

Some talents and status effects have been adjusted to accommodate the higher character levels possible. You can see a summary of these by checking the "Infinite500" tab in Game Options.

Once a character enters the I.D., the level 50 cap is removed and normal stats-per-level progression is enabled from level 51 onward. The limit on how high primary stats may be trained is removed (limited by character level as normal) and dependent computed value limits are also appropriately increased. No additional Prodigies are gained automatically after level 50. (Note that additional category points and (rarely) Prodigies can be gained by completing I.D. challenges.) Talent mastery levels can be improved more than once, and talent levels are unlearnable as normal in the I.D.

NPC levels in the I.D. have been adjusted to be compatible with higher game difficulty settings.

Most monsters and bosses from the Maj'Eyal campaign are imported into the I.D. along with their respective unique drops.

Traps have been added back to the I.D.

Isolated shops can appear randomly in the I.D. There is guaranteed to be at least one shop on level 1, and they become more common for the first few levels, and then more rare with depth.

Random escorts may be randomly generated on each level in the I.D. unless a challenge has been started, until the normal number (9) have been attempted.

The lichform quest is completed in the I.D. with a new random drop instead of automatically being completed at the appropriate step. There is a new greater vault in the I.D. that affects this quest.

The Corruption/Hexes tree can be learned from a new random drop.

Most major events from the Maj'Eyal campaign are enabled in the I.D., and there is a new event that can award the cursed-aura tree.

Undead characters starting in the I.D. begin with an artefact cloak. This is similar to the Cloak of Deception, but its stats scale with character level and it can spawn randomly for other characters.

This addon incorporates some modified game mechanics:
The ability to shrug off critical hits has been changed. Instead of using the percent value to ignore crits completely, it reduces the crit multiplier by the same amount to a minimum of 100%.

Modified checkHit and checkHitOld functions are employed that allow for wider level differences between opponents (see http://forums.te4.org/viewtopic.php?f=36&t=35229).
Saving throws have been modified slightly to make them more effective at reducing the duration of status effects you fail to save against. (See http://forums.te4.org/viewtopic.php?f=36&t=36715 for details.)

Things planned for the future: scaling of world artefacts with character level, map effects with dungeon level.

CORE CODE CHANGES
Key code changes appear in:

Engine:
engine\generator\map\Static.lua
engine\interface\ActorStats.lua
engine\interface\ActorTalents.lua

TOME Module:
mod\load.lua
mod\resolvers.lua
mod\class\Actor.lua
mod\class\Game.lua
mod\class\GameState.lua
mod\class\Object.lua
mod\class\Player.lua
mod\class\interface\Combat.lua
mod\class\interface\TooltipsData.lua
mod\dialogs\LevelupDialog.lua
data\birth\worlds.lua
data\general\events\damp-cave.lua
data\general\events\drake-cave.lua
data\general\events\fearscape-portal.lua
data\general\events\naga-portal.lua
data\general\events\old-battle-field.lua
data\general\events\rat-lich.lua
data\general\objects\world-artifacts.lua
data\general\objects\world-artifacts-far-east.lua
data\damage_types.lua
data\quests\lichform.lua
data\rooms\greater_vault.lua
data\zones\infinite-dungeon\events.lua
data\zones\infinite-dungeon\npcs.lua
data\zones\infinite-dungeon\objects.lua
data\zones\infinite-dungeon\zone.lua
data\zones\ruined-dungeon\grids.lua

Other addons that affect these files might not be compatible.

Removes certain ambient sound effects:
-Barking dogs in towns
-Howling wolves in dungeons
-Eagle screeches

Donators/Buyers bonus!

Entirely defunct as of 1.5.0's many Infinite Dungeon changes.
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This addon is fairly simple.
It adds variety to the Infinite Dungeon!
... oh, want more information? Alrighty.

In it's current version, it randomly swaps out the grid files (which are the tile-sets/how your map looks) and layouts of every floor.

Additionally, floors will steadily get larger (and enemy counts will rise as a result) the deeper you go.
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NOTES

The first floor is always a basic dungeon.
Currently, you may find doors that don't properly blend into adjacent tiles. This is due to not all sets of grid files actually coming with a built-in door, and them instead using the Basic one.
Signposts will always use the basic floor.
Not all layouts support vaults, so for those of you that like diving into instant death, you may be forced to hold yourself back.

Power comes at a price, but the price is worth paying...

This addon adds more Taints to the game.

Taints are Inscriptions powered by corrupt forces. As such, they are arcane so Oozemancers and other Zigur Zealots need not apply.
They do not get egos for scaling, instead they scale on a new stat called Taintmarks.
Taintmarks are a measure of how tainted by corrupted forces you are.
Each Taintmark increases the power and duration of Taints by 20%, but decrease you luck by 1 and increase the cooldown on nature gifts by 1.
Taintmarks are gained in many ways:
Each inscribed Taint grants a Taintmark.
Possessing a corrupt power source like Vim or Hate grants a Taintmark.
Being Undead, becoming Undead or changing your shape grants a Taintmark.
Giving in to your Hate grants a Taintmark.
Having Dark Ritual, Ruin or Blurred Mortality grant a Taintmark.
Having Blighted Summoning, Corrupted Shell, Bloodspring or Legacy of the Naloren grant a Taintmark.

Taintmarks are listed on your character sheet under stats.

Current Taints are only a little more rare than normal inscriptions. In v1 they will be much rarer but certain bosses will have a guaranteed Taint drop.

List of Taints:
Devourer: As before but also eats on of your own sustains for more healing.
Telepathy: As before but both effects have the same duration.
Darkness: Darkens the area, grants a temporary stealth boost and makes you activate stealth mode (even if you don't have it), but decreases your darkness resistance.
Vampire: Adds Life Leech chance and amount, but decreases your light resistance.
Blood Magic: Increases your Spellpower and lets you cast with life instead of mana/vim when needed, but decreases your physical save.
Reaper: Increases you physical power and restores resources on kills, but decreases your spell save.
Inversion: Grants damage affinity all, but changes some of your damage to healing.
Shade: Allows you to walk through walls and grants evasion, but reduces your healing.
Ghoulish Rot: Your hits apply Ghoulish Rot disease but your movement speed is decreased. Also blocks hits from being above a certain amount.
Banshee: Scream doing mind damage and causing confusion in nearby enemies, but silences you.
Bone Thorns: Sharp thorns sprout from your bones causing heavy bleeding damage to enemy attackers, but also causes you to bleed. Also increases armour and hardiness.
Blood Snare: Hurl a blood bomb at the target where it explodes, doing blight damage and pinning enemies. This blood bomb is made from your own blood.
Acceleration: Reduces cooldowns, but then they are on cooldown for longer when used.
Exchange: Removes debuffs from you then inflicts you with another random debuff.

The addon you hope you never have to use.

If all goes well, you never have to touch it. Behind the scenes, BGA monitors the location of every NPC on the current map level.

• In cheat mode you can use CTRL-B to pull up a list of all NPCs with details about their locations. Cheat mode will stamp your character, but it can be used as a last resort to see if a quest-required boss has gone all-out missing or not.

• If an NPC goes outside the map borders or into the middle of a wall (and it isn't a ghost), BGA will notify you and allow you to relocate the offender to a random free tile somewhere else on the level so that you can reach it. The NPC will not be placed into a vault, but it may be in a secluded room you have to dig to reach. Some levels have rooms behind undiggable walls that aren't marked as vaults. At this point, there isn't much that can be done about those locations beyond using a teleport of some sort.

• If a summons is temporarily removed from the level via Time Skip, it remains in your party. If you leave the level before the summons returns, the connection to the summons is severed and it becomes a not-there party member. If you return to the previous level, the original summons will come back out of Time Skip, but it will now be a separate entity from the one that's in your party. The one on the level will sit there and then decay. The one in your party will not decay and will take up a summons slot from that point on, but will not be on any level you visit. BGA will remove the summons in the party slot if the connection is broken, clearing it for future summons.

• If an NPC spawns and is then killed in the same turn, it can sit on that tile 'dead'. If a creature—including yourself—walks over that tile, a clone will be made, possibly creating an impassable roadblock. Hitting CTRL-C will cycle through all tiles on the level and remove any clones it finds.

• Some rooms will spawn a large group of NPCs. If there are more NPCs than tiles, they will exist 'out of phase'. You can't see or target them and can walk through them as if they didn't exist, but party members may attack the tile they are on. If the NPC has an AOE effect on them, such as an Empire Wight's lighting, it may strike you. You may also hear any sounds associated with the NPC. BGA will 'rephase' the NPC once the square they are on is unoccupied. If the tile and NPC are in sight, you will get the message, '[Name] steps out from hiding.' This may result in an unexpected enemy or two showing up in packed rooms once available space is made.

• Log will flush after special actions are taken so that cut/paste is available immediately.

• Checks for invalid Dark Fey Clones (StarKeep's Faerie Race addon)

+ Bugfix: Limmir disappearing immediately after quest completion. Removed check for 'mod.class.PartyMember' on non party members.

• v2.2.2 - Compatible with ToME 1.1.5 to 1.2.2

• This addon cannot be used to cheat and will not reveal any details about NPCs under normal play circumstances. If an NPC needs to be relocated, you will be presented with its current location and why the addon determined that there was a problem, but the new location is not revealed.***

The Lost City of Vulcus

Some events in history are of such importance and have such wide ranging ramifications that they become fixed points -- junctions in time that must and will happen in order to maintain the integrity of the chronoverse.

Lost ages ago, Vulcus was considered by many to be the greatest center of Dwarven learning below the surface. Even up until the fall of Reknor in recent times, however, Dwarven innovation and breakthroughs continued, seemingly by miracle. Fate, however, dictates that one of the greatest untold secrets of the Empire cannot remain hidden forever. Perhaps you will be chosen to take part in this crucial point in history -- to reap the rewards or to suffer the consequences.

This addon incorporates a new major event (like the drake cave or fearscape invasion portal) that has a chance to occur (possibly more than once) on each level in various zones (Infinite Dungeon, Spellblaze Scar, Ardhungol, High Peak, Reknor, Shadow Crypt). Within the game, this event is most like a combination of the Lost Merchant and Limmir quests, and is intended to replace those for characters in the I.D.

Recommended level 10+ (depending on class). The intended difficulty is slightly higher than the Limmir quest, and there are gradations of success. Participating in the event when it spawns is completely optional and you can do it later if desired.

This is possibly the most complex encounter in ToME, with a large number of NPCs, enhanced AI, and various terrain effects. It is compute heavy and will tax slower computers (even with reduced graphics settings).

Player's targetting improvements.
- The initial target for the talents of beam, ball and cone types is chosen to cover as many enemies as possible.
- Visible enemies are marked with colored numbers.
- Red color for NPCs that should be able to attack you if you make an action, green for those that will not, orange for those that will not only able to attack if you move (both participants speed, energy and availability of ranged talents are considered).
- The numbers represent the mobs' relative 'power', they can be used in target selection mode.

Plenum ToolTip: Enhanced tooltip display for ToME version 2.4 for ToME 1.3.0

This addon replaces the normal tooltip for actors in TOME with a more detailed description of monster abilities and characteristics. It adds to the standard tooltip detailed information on speed, main-hand, off-hand, and ranged damage, and damage modifiers and extra crit power, including damage penetration and damage affinities, plus retaliation damage, depending on what options are selected (from a tab in Game Options menu). This makes it much easier to inspect multiple monsters and quickly identify the most threatening. By holding a meta-key (ctrl, alt, or shift) and hovering the mouse over a monster, information on its status immunities and talents is displayed.

In addition, information on temporary terrain features (like smoke and darkness) and map effects (from spells and the like) will be displayed in the terrain tooltip if the appropriate options are enabled.

Combines several smaller utility addons, both for convenience and potentially reduced resource usage on smaller machines.

Includes the following addons:

• Notes to Self
• Timed Rest
• Talent Point Planner
• Opt-in Adventurers Parties
• Inventory Show All Tabs By Default (thru v12d)
• Tier-1 Short Circuit Option
• "Save" Talent/Stat Points
• Use Item Shortcuts (as of v5)
• Auto-Transmo Gems (as of v5)
• Online Indicator (v6a thru v13d.3)
• Inventory Sort Order (as of v7)
• Store Wish List (as of v8)
• Inventory Keys (as of v8)
• Alternate Zones Option (as of v10)
• Go to Landmark (as of v11)
• Enhanced Object Compare (as of v12)
• Enhanced Wield Replace (as of v14)
• Pragmatic Heroism (as of v14b)
• Prodigious Progress (as of v14c)
• Savefile Notes (as of v15)
• Item Notes (as of v15)
• Passive Cooldowns (as of v15)
• Low Health Popup (as of v15)
• Restart Sustains (as of v15)
• Effects Under Actors (as of v16)
• Juggle Hotkeys on Unwield (as of v16)
• Longer Character Names (as of v16)
• Das BLinkenlights (as of v16)
• Wall Clock (as of v16)
• Curse Levels (as of v17)
• Displacement Tracking (as of v17)
• Examine Floor Stack (as of v17)
• Verbose Crystal Resonance (as of v17)
• Golem Gender (as of v17)
• Self-Portrait Over Grass (as of v17)
• Semi-Roguelike Mode (as of v17)
• Menu Keys (as of v17)
• Reflected Golem (as of v17)
• Roguelike Keybindings (as of v17)
• Tooltip Cleanup (as of v17)
• Time Shield Tracking (as of v17)
• Alchemist Notifications (as of v17)
• Don't Summon While Meditating (as of v17)
• Herald of the Herald (as of v17)
• Roguelike Chat Guard (as of v17)
• Sword-n-Boardin' (as of v17)
• Plot Disarming (as of v17)

A superset of ZOmnibus Lite.

Frequently Asked Questions:

• What's the difference between ZOmnibus and ZOmnibus Lite? Can I use them both together?
• What game options does ZOmnibus provide to configure its behavior? (updated for v16)

Important: this addon will have no effect if left unconfigured! Please read the description!

Recommended settings:

hit escape -> video options

• Requested FPS: 30
• Resting divider: 10
• Running divider: 5

Description:

Enables faster run/resting by use of FPS dividers.

These dividers simply divide the game's requested FPS by their respective values while resting or running. After starting a new game or loading a saved character, configure this addon by hitting escape -> video options. Setting these dividers to something greater than one can substantially reduce the amount of time required to finish resting/running on older computers.

Just be careful when resting on an escort mission...

Changelog:

See the forum discussion for the changelog.