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Addons are way for third parties to modify existing modules inside t-engine. Since the game Tales of Maj'Eyal is a t-engine module, this is how you write addons for ToME, just like the ones in the Steam Workshop.


You're making an addon. The addon is named "coolstuff". The first thing you do is make a directory "tome-coolstuff" inside your Steam install of ToME. On my mac, that path is:

~/Library/Application Support/Steam/SteamApps/common/TalesMajEyal/game/addons/

And on Windows, it's usually something like

C:\Program Files (x86)\Steam\SteamApps\common\TalesMajEyal\game\addons

On Linux, the path is


Your addons directory should have these files in it already:


If you can't find the directory, search for one of those file names.

Getting Started

Every addon has an init.lua file. The init.lua file looks like this:

-- My Cool Addon
-- tome-coolstuff/init.lua

long_name = "My Awesome Addon"
short_name = "coolstuff" -- Determines the name of your addon's file.
for_module = "tome"
version = {1,3,1}
addon_version = {1,0,0}
weight = 100 -- The lower this value, the sooner your addon will load compared to other addons.
author = {''}
homepage = ''
description = [[Oh my god this stuff is so totally cool.
Holy crap I mean it's really super cool, like, wow.
]] -- the [[ ]] things are like quote marks that can span multiple lines
tags = {'cool', "stuff", 'cool stuff'} -- tags MUST immediately follow description

overload = true
superload = false
data = true
hooks = true

addon_version is (unsurprisingly) the version of your addon. This is used by the game for automatically downloading addon updates. It's also useful if players want to see which addon version they're currently using. Set it to {1,0,0} initially and increment the value when releasing updates.

version is the module (i.e., ToME) version required for the addon. When making a new addon, you should typically set this to the current ToME version. When releasing addon updates, you should modify this value if your addon changes rely on features from a more recent ToME version.

Properly setting overload, superload, hooks, and data is super important, because they determine which directories in your addon will be loaded by the game.

Directory Structure

  • overload: Files in this directory will automatically replace files in the base game. This is very powerful but also incredibly dangerous. (Of course, replacing things like icons is less dangerous than replacing code.)
  • superload: Files in this directory will be read and executed after the base game's file of the same name. This is very powerful but much less dangerous. This is a great way to add content (like new Artifact items) or tweak content (modify a talent's cost or requirements) without accidentally stepping on other tweaks or future content updates.
  • data: Files in this directory will just sit there and be ignored unless you explicitly tell the game to read them. Files in this area live in their own "namespace" and filenames here will never interfere with other addons or the base game. This is a great place to put new classes, talent trees, or races.
  • hooks: Only one file in this directory is automatically executed: load.lua. This file is a great way to get your "data" files executed at the proper time. It's also a way to augment some parts of the game which specifically support hooks: the Example module shows how the "Actor:takeHit" function is hooked to make the tourist take no damage. You can also use hooks to load add-on data in to the module, eg. new talents. Find a list of available hooks here.

The Example addon can be found here:

A .teaa file is simply a renamed zip that contains the whole addon, so feel free to rename and unzip your favorite addon to see a living example of all the stuff discussed in this article. The tome-example.teaa addon illustrates how to add a new class, new talents, new timed effects and how to hook onto a few useful locations in the code. (Note that it's a bit old, though.) When zipping, make sure to zip the files but not the folder. For example,, not

You can also just put a folder 'tome-addonname' in addons and it will be loaded directly, no need to zip or rename.

Grammar and Syntax

  • The addon folder must be in the format [ModuleName]-[AddonShortName]. For you, that means tome-coolstuff is your folder name.


Each .teaa file is just a zip file. The main ToME game code is stored in game/modules/, and it is also just a renamed zip file.

Copy somewhere, rename it to and unzip it.

You'll see two directories: "data" and "mod". Most of the stuff you'll want to mess with at first is in "data".

When you use overload to replace a file, the path and name must match exactly the structure in So for example, to replace the types of leather boots in the game, I'd look in the unzipped ToME code and find:


... and so to overload that, I'd create a file in my addon:



Just like overloading, superloading requires that you know the file structure of the game so you can make your files get read and executed at the right time. When the game reads in your superload file, you can get access to the previous file's contents using the loadPrevious(...) function.

For example, if we wanted to add a new boot ego, we could do something like this. First, we'd find the boot ego code:


Next, we'd make a file in our superload directory:


... and we'd make sure that our init.lua file had the line:

superload = true

We're ready to add the boot ego!

local _M = loadPrevious(...)
	power_source = {arcane=true},
	name = " of sensing", suffix=true, instant_resolve=true,
	keywords = {sensing=true},
	level_range = {1, 50},
	rarity = 4,
	cost = 2,
	wielder = {
		see_invisible = resolvers.mbonus_material(20, 5),
		see_stealth = resolvers.mbonus_material(20, 5),
		blind_immune = resolvers.mbonus_material(30, 20, function(e, v) v=v/100 return 0, v end),

return _M

Modifying mod Stuff

Hold on, that example still didn't use _M at all! So what is _M for? Since most things in the data directory are stored in easily accessible structures, you don't need _M to get them. _M is generally used for stuff in the mod directory: the most dangerous stuff to modify. Here's an example which modifies the "levelup" function in mod/Actor.lua. Your file for this code should be in /superload/mod/Actor.lua.

local _M = loadPrevious(...)
local base_levelup = _M.levelup

function _M:levelup()
  -- Do stuff "before" loading the original file

  -- execute the original function
  local retval = base_levelup(self)

  -- Do stuff "after" loading the original file

  -- return whatever the original function would have returned
  return retval

return _M

Uploading your Addon

Once your addon works and you want the world to see it you need to follow some simple steps to get it up on (and Steam Workshop if you own ToME on Steam):

  • Check to make sure your addon has tags specified in the init.lua file (tags = { 'races', 'human', 'challenge'}). The tags should be descriptive to assist searching on the website.
  • Create a folder with the format "tome-[short_name]", where the short_name is the same as that specified in the init.lua (tome-humansextended).
  • Place your addon folder in the [TOME install folder]/game/addons folder, and copy into it all of your addon files (init.lua, data folder, hooks folder, overload folder, superload folder).
  • Make sure developer mode is on (from the main menu: Options >> Developer mode >> Yes).
  • Make sure you are logged in-game.
  • Make a new character with the addon enabled.
  • Enter debug menu (ctrl+a if you didn't re-bind it), and choose the Addon Developer menu.
  • Select the option to register a new addon if this is the first time uploading this addon.
  • Select the option to publish the addon to the website.
  • Wait as the game packages and uploads your addon.
  • Optional: do the same thing with the Steam upload.
  • If you are having trouble uploading to steam. Try Purging Cloud Saves (From the main menu: Options >> Steam >> Purge Cloud Saves). These can be in a bad state and block uploading.
  • You're done, your addon should now appear on addons list.
  • Optional (but recommended): Create a forum account and start a new topic in the Addons section to give players a place to provide feedback about your addon and link to the topic from the addon page created for your addon. You will have to wait for a moderator to approve your topic before you can link to it.

To update your addon on the Steam Workshop: Edit your addon on your profile page to be able to enter the addon steam workshop id (check workshop page url for id), allowing you to update your old workshop entry.

Notice: If you are having trouble updating the addon with steam where it updates but doesn't really update, but not with, you could be running into an exotic bug with steam synchronization. This set of steps discovered by stuntofthelitter has fixed several people who have run into this problem: Re-enable steam cloud in ToME. Let steam sync. Ran the game, disabled steam cloud saves, did NOT purge data.

A second fix for steam because that first one didn't help me : go to C:\Users\[username]\T-Engine\4.0\tome\user-generated-addons and replace the old zip file with the new one, done.