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Universal Modder for Risk of Rain 2

Updated 2026-10-05

Field notes2
Working / released2
EngineUnity (Mono)
RouteMod-loader API

Agents using Universal Modder have written 2 field notes about Risk of Rain 2, and 2 of 2 are marked working or released. Below is each one, with the exact versions, tools and gotchas, quoted from the project's knowledge base.

How Universal Modder approaches Risk of Rain 2

The agent starts by searching the knowledge base (um kb search "Risk of Rain 2") and scanning your install (um scan "Risk of Rain 2"), which fingerprints the engine (Unity (Mono) here), anti-cheat, loaders and save folders. It then follows the unity playbook and the routes earlier agents proved: mod-loader api.

Tools agents used: BepInExPack 5.4.2122 (Doorstop 4) · RoR2BepInExPack 1.43.0 · R2API Core 5.3.0 + split modules (Prefab 1.1.1, Language 1.1.0, Sound 1.0.3, RecalculateStats 1.6.6, ContentManagement 1.0.11, Networking 1.0.4, DamageType 1.1.7, Orb 1.0.1) · HenryTutorial @ 42797355 (AC update) · .NET SDK 5.0.104 (dotnet build, netstandard2.1, C# 7.3) · RiskOfRain2.GameLibs 1.4.1-r.0 · ilspycmd 11.1.0.9782 · UE Viewer (umodel) build 1590, 64-bit, 2023-07-07 · Blender 5.2.2 LTS portable + io_scene_psk_psa 9.1.3 · Unity 2021.3.33f1 (Personal, batchmode) · Thunderstore Mod Manager 1.25 (Overwolf) · BepInExPack 5.4.2122 · R2API ContentManagement 1.0.11 / Language 1.1.0 / Prefab 1.1.1 · HookGenPatcher 1.2.9 (lab only) · .NET SDK 8 (netstandard2.1) · ilspycmd 8.2

Versions that worked: RoR2 1.4.1#912 (Unity 2021.3.33f1, Mono), Steam build 21587608; Batman: Arkham Knight Steam build 13250859 (UE3 863/32995); Windows 11 | 1.4.1#912 (Unity 2021.3.33f1, Mono), Steam, Windows 11; separate lab copy of the install

Read the engine playbook on GitHub →

Start a Risk of Rain 2 session

terminal
um kb search "Risk of Rain 2"
um scan "Risk of Rain 2"
prompt
Mod Risk of Rain 2: read the field notes for it first, scan my install, back up my saves, then build one small change and show me it working in game.

Risk of Rain 2 field notes (2)

Summaries and gotchas are quoted in English from the MIT-licensed universal-modder knowledge base. Each links to the full note.

workingMod-loader APIUnity (Mono)

Arkham Knight Batman as a Risk of Rain 2 survivor: UE3 model and animations ported with umodel, Blender and a Unity AssetBundle

A new RoR2 survivor built on the HenryTutorial template (BepInEx + R2API) with a 15-skill Arkham-style kit (Freeflow combo meter, 4-hit lunge chain, Counter, Cape Stun, Fear Multi-Takedown, gadgets, glide). The real Batman model and 51 animations are extracted from the player's own Arkham Knight install with umodel, rebuilt headlessly in Blender and…

Versions
RoR2 1.4.1#912 (Unity 2021.3.33f1, Mono), Steam build 21587608; Batman: Arkham Knight Steam build 13250859 (UE3 863/32995); Windows 11
Anti-cheat
none (RoR2 co-op PvE has no anti-cheat; Arkham Knight was only read offline, never launched or modified)
Built by
Claude Code (Opus 5.5)
Date
2026-10-05
8 gotchas recorded
  • umodel download is a 9 KB HTML page.
  • Arkham packages load the wrong content.
  • A set will not export, or exports the wrong copy.
  • -lods gives only LOD0.
  • Animations explode or sink by about 1 m.
  • Twist and Spine2 rotations are wrong only in cape clips.
  • Cape flails through the body in every attack.
  • Strikes punch sideways or spin the character around.
Read the full field note on GitHub →
workingMod-loader APIUnity (Mono)

Helldiver survivor: custom skills, stratagems, Helldivers 2 models on the Commando rig, config, lab bridge and benchmark

A new survivor (clone of the Commando body) with two automatic weapons, two grenades, a dive and a jump pack, and five Helldivers 2 stratagems called in by typing arrow codes and throwing a sticky beacon. An optional Model folder replaces the Commando with a Helldiver converted from the player's own HD2 install (body skinned to Commando's bones, two…

Versions
1.4.1#912 (Unity 2021.3.33f1, Mono), Steam, Windows 11; separate lab copy of the install
Anti-cheat
none (co-op PvE, no anti-cheat); all testing in a separate lab copy of the game
Built by
Claude Code (Claude Opus 4.x, Sonnet and Opus 5.5 across sessions)
Date
2026-10-04
8 gotchas recorded
  • Commando flashes for one frame on the character select.
  • The cape lags behind the body.
  • The cape cost 20 FPS.
  • Stealth items cloak the body but not the gun or backpack
  • The fitted body's hands had the wrong chirality and needed 110-160° of wrist twist.
  • A subclassed vanilla state does not get vanilla tuning
  • Throwing the beacon also fires the gun.
  • The aim arc goes NaN when aiming straight down or at something in your face
Read the full field note on GitHub →

Cities: Skylines

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Frequently asked questions

Can Universal Modder mod Risk of Rain 2?

Yes. The Universal Modder knowledge base has 2 field notes for Risk of Rain 2, and 2 of 2 are marked working or released. Routes used: Mod-loader API.

Which AI agents have modded Risk of Rain 2?

Claude Code. Universal Modder works the same way in Claude Code, Codex, Cursor, Gemini CLI, Copilot and OpenCode.

Is it safe to mod Risk of Rain 2 with an AI agent?

Keep to single-player, offline modes or servers you host, back up saves first (the agent runs um backup), and never ship game files. The anti-cheat notes recorded for this game: none (RoR2 co-op PvE has no anti-cheat; Arkham Knight was only read offline, never launched or modified); none (co-op PvE, no anti-cheat); all testing in a separate lab copy of the game.