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Tamriel Rebuilt (commonly abbreviated as TR) is the largest collaborative fan-based modding project for the Elder Scrolls series, with the goal of creating the mainland of Morrowind.

Tamriel Rebuilt currently covers all of northeastern Morrowind and much of the eastern and central part of the province, with the latest release adding the rest of the   region south of Vvardenfell. The next release will continue west into the  ,  ,  , and southern   regions. The project has existed since before Morrowind s release, though the leadership and members have changed many times since then.

A collection of province mods, Project Tamriel, shares assets with Tamriel Rebuilt through Tamriel Data, and they are meant to complement each other.

Both expansions, Tribunal and Bloodmoon, are required to play this mod.
 

History
Tamriel Rebuilt was founded in 2001 by a gaming enthusiast under the alias 'Ender', as a reaction to Bethesda's announcement that the then-upcoming The Elder Scrolls III: Morrowind would not contain the entire province, but merely the island of Vvardenfell. Over the years, this very large and long-lived project has been supported and built by over 200 developers, modders, and contributors.

Prior to 2010, Tamriel Rebuilt planned to divide the mainland of   into six distinct maps, all of which were to be developed separately and sequentially. A reorganization in 2009 redivided the landmass into eight maps with hopes of increasing productivity and general public accessibility. After further reorganization in 2014, the TR team again changed the project's release structure, focusing on releasing playable areas as they're finished, rather than the eight major planned "releases". The project's vision has also undergone a change, and now works to integrate itself with the original game's content to make the entire province feel and play like one seamless experience.

The Map-based releases that were completed and released to the public include Maps 1, 2, and 3.
Map 1 — Telvannis, released 23 September, 2006
Map 2 — Antediluvian Secrets, released 30 November, 2008
Map 3 — Sacred East, released 6 June, 2012
Both Telvannis and Antediluvian Secrets cover the northeastern peninsula traditionally ruled by  , but now facing Imperial and   incursion. Sacred East is centered around  's eastern cities and the sacred Temple city of  . 

Releases after Sacred East were no longer labeled by Map, but by a   version number, starting with 14.08 (August 2014). Versions between the last update to Sacred East and 18.07 did not add any new playable landmass, but rather worked on integrating existing content with the original game through the use of separate plugins:
15.12 — Integrating the mainland and Vvardenfell   networks through  
16.09 — Moving newly developed, multiple-mod compatible game assets into a central repository, Tamriel Data
17.09 — Continuing to integrate Tamriel Rebuilt with Vvardenfell by deprecating mainland branches of   in favor of their originals through  

The next main release, 18.07 (31 July, 2018), titled Old Ebonheart, was focused around the central Imperial city of  , located in the northeastern part of  , the region directly south of Vvardenfell and home to the mighty  . Following this was 19.12 (19 December, 2019), titled Aanthirin, which completed that region and includes the notable settlements of  , an important river crossing and pilgrimage city controlled by the Temple, and  , the beautiful chapel city of  .

The current release is 21.01, a maintenance release for Aanthirin. The next major release is expected to be named Dominions of Dust, which will expand west to add much of the  ,  ,  , and southern   regions. It may be released concurrently with Embers of Empire, which will include a near-total overhaul of the city of Firewatch (initially released in 2006) and the town of Helnim (first publicly available in 2008); included in the expansion will also be a major update to the island of Althoa (formerly Balvvarden) and the hamlet of Bal Oyra. 

Tentative plans for future development continue the expansion south into  ,  , and   to complete  's holdings, then up through   to complete   (possibly including the Orc-inhabited mountain region of  ), returning south into   and the other   lands, and concluding with the massive capital city  . After this, there are major plans in place to redo the old Maps 1 through 3 areas to bring them up to current standards. Some developers also have a desire to begin a new project creating Black Marsh, with the working title Eye of Argonia.

Organization Process
Overview
Development of a region typically starts off with planning and conceptualizing the lore (such as important locations, people, and factions), assets, and appearance of the area. Asset development is started early on, and remains the primary bottleneck for exterior development to start. As exterior claims are completed, interior claims open up. NPCs, creatures, and generic dialogue are included when all necessary interiors are done. Quests and questlines are designed, written, implemented, and playtested. With all of these components merged into one section file, they can be combined with the main mod.

Development
Files for Tamriel Rebuilt are organized into individual assets, claims, and release files.

Assets are the building blocks of the game world, including Models, Writing, and Audio. An asset is either proposed by a member or requested by a lead developer. Once an asset has been created, it undergoes a reviewing process. Should it be accepted, it will either be turned into a claim (such as in the case of quest designs), or flagged for merging into a temporary add-on to Tamriel Data, which itself is merged into the main Tamriel Data files when there is a major release.

Claims are individual playable aspects of the mod, which make use of all created assets: Exteriors, Interiors, and Quests. Once a claim has been fulfilled by a developer, it undergoes a similar reviewing process. Designated users thoroughly examine every aspect and detail added by the claim, fixing issues they find so that the claim can be set as ready to merge. If the claim has too many issues or does not fit the claim description, it can be rejected and returned to the original developer for a redesign. Incorrectly placed objects are the most common issue with exteriors and interiors, with terms such as "casper", "floater" and "bleeder" used to describe their bad placement. Quests may have scripting errors, dialogue typos, and dialogue loops, among many other issues. For this reason, quests are playtested by various people at all stages of the claim process.

Claims and assets are given a priority: low, medium, high, and critical. For claims specifically, critical means required for the next release, high for two releases away, medium for three releases away, and low for anything else.

Release files include TR_Mainland and various section files that together form the latest TR_Preview. Section files are checked out by senior developers and most work involves merging completed claims so that a connected game world is formed, as well as fixing bugs. When nearing a release, one or more sections are merged into TR_Mainland, and upon release the others are merged together into a new TR_Preview.

Release Cycle
Following the first three large-scale releases, Tamriel Rebuilt switched to a quarterly (later biyearly) release cycle and soon began to make incomplete content available through TR_Preview. This was done to keep the mod from appearing inactive for long periods of time. This cycle lasted until near the completion of the Old Ebonheart release in 2018. Since then, Tamriel Rebuilt has a named release only when a new part of the landmass is finished, with a bugfix update in the following months which does not change TR_Preview.

Website
Tamriel Rebuilt's website is also divided into Development (containing the Asset and Claims browsers, Bugtracker, and Release Files) and Community (containing the Forum, Discord, and IRC links) and access is restricted to certain members of the project. Guests can view all forums, claims, and assets. Members can comment on each of them and ask for the assignment of assets, and developers can ask for assignment on claims and assign themselves to assets. Lead developers regulate asset and claim assignment, and control the implementation of the planning.

Planning and general meetings are held every Sunday in TR's Discord server in a dedicated meeting channel. All meetings are open to the public and everyone is welcome to join and contribute.

Plugins
Tamriel Rebuilt requires the installation of a main file and the standalone Tamriel Data asset archive. There are several optional plugins to choose from as well.
;TR_Mainland.esm
:The main mod file, which adds all officially released lands and quests.
;TR_Preview.esp
:Includes any unreleased lands and quests. Content may lack quests, new dialogue, NPCs, interiors, or exteriors, though a basic heightmap covers most of the future landmass where exterior development has not begun.
;TR_Travels.esp
;TR_Travels_(Mainland_and_Preview).esp
:Connects Vvardenfell's travel network with the mainland's by adding new connections and rerouting others when the limit of four connections makes new connections impossible. For more information, see the   page.
;TR_Factions.esp
:Slows down advancement in some factions to accommodate for Tamriel Rebuilt's new quests, changes dialogue to reference the mainland, adds faction reactions to new factions, and requires you to convince more councilors for the Hortator quests (only Telvanni for now). For more information, see the   page.
;TRMusic
:Includes three new battle tracks and seven new exploration tracks that may play anywhere in the game. It is packaged as an optional download on the main download page. A more recent   utilizing MWSE is available as a separate mod.

Gameplay Information
Gameplay information specific to its inclusion in TR. For more generic information not listed here, see the main Tamriel Data page.
 
 
 
 
 
 

World Information
World information specific to its inclusion in TR. For more generic information not listed here, see the main Tamriel Data page.
 
 
 
 
 
 
 

External Links
Tamriel Rebuilt's official website