Iris and Minecraft Version

Iris v1.1.0 + Sodium for MC 1.17

Are you running Sodium along with Iris?

Yes

Operating System

Win 10

What is your GPU?

GTX 1070

Java Version

Java 16

Reproduction Steps

1. Start Medival Minecraft Fabric Modpack with Iris Shader --> CRASHES
2. Deactivate Illuminations Mod --> Game starts normally

Crash Report file and latest.log

Can give you Crash report because no log will be saved after GD Launcher say it was crashing

EDIT.:
https://pastebin.com/Z9zmpVWw

Additional context

No response

So the illuminations mod seems to mixin to sodium, but due to modifications either in sodium 1.17 or iris sodium it cannot apply them. Can you confirm this with 1.17 upstream sodium?

This should be fixed by illuminations 1.6.