How to Download and Use the Project Britannia Engine and Modding Tools

Updated

Project Britannia hosts two things you can actually use: the Project Britannia game engine (installable in your own development environment for use with the Siege Editor) and the Siege Tools development toolset for building your own mods. Both are available as downloads from the site, alongside a wiki, Skrit API documentation, and a forum. There is no pricing information on the site, so treat download and access terms as unconfirmed until you check the pages yourself.

What you can get from the site

Resource What it is What you use it for
Project Britannia game engine The engine built for the project Installing into your own development environment and pairing with the Siege Editor
Siege Tools Development toolset Creating your own mods
Wiki Record of the Project Britannia featureset plus historical details Checking what the engine supports before you build
Skrit API documentation Docs for the custom "Skrit" API Customizing the Dungeon Siege game engine
Forum Community space Connecting with other modders, posting about Ultima V: Lazarus and The Ultima 6 Project, getting help

The site also links to the two finished games built on this engine by Team Lazarus and Team Archon: Ultima V: Lazarus and The Ultima 6 Project. If your goal is playing rather than modding, those are the downloads you want.

Setting up the engine for modding

The site describes the engine as installable "in your own development environment for use with the Siege Editor," but it does not publish a step-by-step setup guide. The site's own author notes that how-tos, an installation FAQ, and a modder setup guide are things that "may" be added at some point — meaning you should not expect them to be there now.

That leaves you with this practical sequence:

  1. Download the game engine from the site.
  2. Install it into your development environment.
  3. Open it with the Siege Editor.
  4. Download Siege Tools for mod creation.
  5. Keep the Skrit API documentation open while customizing the engine — Skrit is the scripting layer used to modify Dungeon Siege behavior.

Expected result: a working engine install you can open in the Siege Editor, with Siege Tools available for building mods.

Where people get stuck: the missing setup guide. Because the site does not document the exact install path, environment requirements, or Dungeon Siege version handling, the forum is your realistic fallback for installation problems — it is described as the place to "get help with the games" and connect with other modders.

Before you start

  • You need Dungeon Siege 1. The engine is built on Gas Powered Games' Dungeon Siege engine, and the project's purpose is running Britannia content on that engine.
  • Expect an old toolchain. Work on the project began around 2005, and the development blog is described as mostly dead links and stale announcements. Modern-hardware compatibility is claimed for the games, not guaranteed for the modding toolchain.
  • Check the wiki first. It records the engine's featureset, which tells you what you can and cannot build before you invest time in setup.

If you only want to play

Skip the engine and tools. Download Ultima V: Lazarus or The Ultima 6 Project — the two games built on this engine — and use the forum for help with either. The site's stated goal is that you can play Ultima V and Ultima VI on modern hardware with enhanced gameplay and graphics.