Excession Tool Overview

Excession is one of the modding tools for Halo MCC.

This tool allows you to upload your mods for Halo MCC to the Steam Workshop. Particularly, Excession supports uploading of mods for the following Halo titles:

  • Halo: Combat Evolved
  • Halo 2: Classic
  • Halo 2: Anniversary
  • Halo 3
  • Halo 3: ODST
  • Halo: Reach
  • Halo 4

Before uploading, you can perform all necessary configuration of your mod using this tool: you can create a campaign consisting of of multiple maps, add a set of multiplayer or Firefight maps, and so on. During this setup, you can configure all necessary images and logos, names, descriptions, map settings, add links to appropriate Game Variant files, configure insertion points, etc.

This guide provides basic info on the usage of this tool and operations necessary to configure a mod (after creation of its .map files) and upload it to Steam Workshop.

If you are looking for a specific section, you can find links to each area below:

Initial Setup

Creating a Mod Package

Viewing and Editing a Mod Package

Uploading a Mod Package

Appendix A: UI of Excession

Appendix B: How to generate the "multiplayer_object_types.bin" file