Mods

TERA has extensive support for modding the game.

Different approaches to game modding:
 * client side mods generally only change game's aesthetics, like change the appearance of gear, costumes, in-game effects, UI elements etc.
 * 3d party programs

Client Side Mods
Game assets are under directory TERA\Client\S1Game\CookedPC mostly in GPK packages.

64-bit client that was released in August 2020 unfortunately broke all old mods. Instead of single asset in one file (like one costume in single package), most of game data is now collected into larger files. GPK files under \Art_Data\Packages\CH\PC contain links into resources stored in composite files. Resources are indexed in file CompositePackageMapper.dat that has links into correct composite files and offsets.

To install your mod you need to edit CompositePackageMapper.dat so that TERA loads modded packages instead of originals.

First tool for modding 64-bit client was Terahelper v1.0 x64 Edition released in September 2020. Other package for this is TMM aka Tera Mod Manager. TMM also includes Real Editor viewer which can export assets and create composite packages.

In pre-64-bit client modding was really easy, you just dropped file package.patched.gpk into directory and it was loaded before game files. With 64-bit client you need TMM or similar program to install mods.

Links

 * https://lolilori.wixsite.com/tera-candy/single-post/2015/06/20/intro-to-tera-mods description of old mods system (pre 64-bit)


 * https://github.com/GoneUp/GPK_RePack/releases/tag/v1.0 Terahelper v1.0 x64
 * https://github.com/VenoMKO/TMM
 * https://github.com/VenoMKO/RealEditor/wiki/64-bit-modding.-How-does-it-work%3F