All tools

MJOLNIR Tag Editor

Browse and edit the Blam tags, textures and audio inside your installed game.

A desktop editor for the game's own data. It reads the installed containers directly — no extraction step, nothing shipped is ever modified — and turns them into something you can search, read and change. Edits become a mod project you can test in the running game and publish to the hub.

Previews

Get it

Install from the launcher

The launcher's Tools view installs this, checks the download against the hash below, keeps it updated, and starts it on whichever installation the launcher is set to. This is the path to take unless you have a reason not to.

Download the launcher

What it does

Every asset, four ways in

Browse by file path or by Blam group, or narrow straight to the textures or the audio. Search spans all 101 groups at once, and anything you open gets a tab of its own.

Values you can trust

Each tag says whether its field walk consumed the whole payload — values exact or values partial. A tag that cannot be read names the field the walk stopped at instead of guessing.

Edits that verify themselves

An edit is applied to a copy, re-parsed from scratch and read back before it is recorded. A value that does not fit is refused and the field is left alone, with the reason shown.

Mod projects, not loose files

Edits autosave into a project as a recipe of what changed. From there: test in game as an override container, export a .mjolnir archive, or publish straight to the hub.

Textures and audio

4,787 of the install's 4,844 textures decode and export as PNG. The Wwise banks play in place, named by the event that fires them rather than by a numeric id.

Live mode

Write a value into the running game and see it immediately — no bake, no restart, nothing touched on disk. Verified end to end: jump velocity 9.0 → 25.0 took a jump arc from 3,005 cm to 11,618 cm.

What you need

OSWindows 10/11 (64-bit)
RuntimeWebView2 (included in Win 11)
GameHalo Campaign Evolved (Steam)
OodleOptional — a decoder is built in

Nothing shipped is ever modified: the game's containers are opened read-only, and an edit produces a new file.