Observed behaviour

I started while using Embeddium and Oculus for shader pack usage. Had a crash that kept flagging Oculus, Valkyrien skies, MoreMcMeta, then while using an AI crash log reader to help troubleshooting I ended up removing those 4 mods ending with Oculus, but still the render issue continued happening during startup. Then the last mod I disabled was Iron's Spell book, due to the crash report flagging a mixin regarding 'spinattackeffect' with irons, that is when the crash stopped reoccuring. I will provide a crash log, and hopefully figure out whats happening.

crash-2025-09-08_19.57.07-client.txt

Expected behaviour

Before updating my mods recently, (only Valkyrien Skies and moremcmeta, and irons were updated out of the previously listed mods.) the modpack worked fine. After a large update, the game started crashing.

Steps to reproduce

Using the combination of Mods that are listed in the crashreport summmery. With 1.20.1, forge 47.3.0 on Curseforge launcher, Updating from a previous version set to the current, iron's spellbooks being updated from version: 3.4.0.9 to 3.4.0.10 (Not the higher version: 3.4.0.11 because it is not compatible with my current forge version.)
NOTE: The testing and crashing was in a SINGLE player launch attempt, though I am running a dedicated server as well.

Server Type

Dedicated Server

Crashlog

https://gist.github.com/werewolf31/54d5a89290225b9b103cce33e7b7417a

Iron's Spells N Spellbooks version

irons_spellbooks-1.20.1-3.4.0.10.jar

Forge version

Forge: net.minecraftforge:47.3.0

Other mods

They are listed in the Crash Report.

Crashlog Check

• I understand if this is a crashbug and I did not attach a crashlog, this will not be handled

Fabric Check

• I understand if I am using Farbic APIs or Connector, this will not be handled

update forge