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mod

UmbralMithrix

A reworked Mithrix fight that uses new mechanics. Configurable.

TweaksModsEnemiesAlloyed Collective
Latest version
2.5.21
Downloads
777.1k
Depended on by
40+ projects
Rating
43
Filed under
Tweaks, Mods
Updated
4 mo ago
Available on
Thunderstore

Download

From UmbralMithrix’s own host. Nothing is re-hosted here.

2.5.21release10 May 2026

Nuxlar-UmbralMithrix-2.5.21.zip · 0.2 MB

Download latest
Older versions4
  • 2.5.2012 Feb 20260.2 MBGet
  • 2.5.1912 Jan 20260.2 MBGet
  • 2.5.1811 Jan 20260.2 MBGet
  • 2.5.1712 Dec 20250.2 MBGet

Frequently asked

How do I install UmbralMithrix?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and Risk of Rain 2 all have to be on the same version, which is the usual reason a mod does not appear in game.

Where do I download UmbralMithrix safely?

From the author's own page on Thunderstore, which is where the data here is synced from. IndexGG never mirrors, re-hosts or repackages a file: every download button points at the original source, so you get exactly what the author published.

Which Risk of Rain 2 versions does UmbralMithrix work on?

The author has not declared a supported version in the metadata we sync, so there is nothing here we can state as fact. Check the project's own page before installing it, and treat an old mod with no declared version as untested on modern Risk of Rain 2.

Dependencies

From release 2.5.21, the newest one. An older release may need different things.

Needs 4

Install these first or it will not load.

  • RiskofThunder-R2API_Language(not indexed yet)
  • RiskofThunder-R2API_Prefab(not indexed yet)
  • Rune580-Risk_Of_Options(not indexed yet)
  • RiskofThunder-R2API_ContentManagement(not indexed yet)

Needed by 40

Removing this breaks every one of them.

Last checked 2 mo ago against Thunderstore. We do not host files and we do not republish descriptions; every download link points at the author’s own release.