Looks like it crashes with the First Person Model mod when the FirstPersonModelCore.instance is null. Most likely because it hasn't initialized yet
Tested with:
Fabric API 0.92.3+1.20.1
Arcanus Continuum 0.111.2
Cardinal Components 5.2.3
FirstPerson 2.4.8
Patchouli 1.20.1-84-FABRIC
Resourcefulconfig 2.1.2
Sparkweave Engine 0.6.0

---- Minecraft Crash Report ----
// Hey, that tickles! Hehehe!

Time: 2025-01-10 00:03:10
Description: Initializing game

java.lang.RuntimeException: Could not execute entrypoint stage 'client' due to errors, provided by 'arcanuscontinuum' at 'dev.cammiescorner.arcanuscontinuum.client.ArcanusClient'!
at net.fabricmc.loader.impl.FabricLoaderImpl.lambda$invokeEntrypoints$2(FabricLoaderImpl.java:403)
at net.fabricmc.loader.impl.util.ExceptionUtil.gatherExceptions(ExceptionUtil.java:33)
at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:401)
at net.fabricmc.loader.impl.game.minecraft.Hooks.startClient(Hooks.java:53)
at knot//net.minecraft.class_310.(class_310.java:458)
at knot//net.minecraft.client.main.Main.main(Main.java:211)
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:480)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)
at org.prismlauncher.launcher.impl.StandardLauncher.launch(StandardLauncher.java:105)
at org.prismlauncher.EntryPoint.listen(EntryPoint.java:129)
at org.prismlauncher.EntryPoint.main(EntryPoint.java:70)
Caused by: java.lang.NullPointerException: Cannot invoke "dev.tr7zw.firstperson.FirstPersonModelCore.getLogicHandler()" because "dev.tr7zw.firstperson.FirstPersonModelCore.instance" is null
at knot//dev.cammiescorner.arcanuscontinuum.common.compat.FirstPersonCompat.init(FirstPersonCompat.java:10)
at knot//dev.upcraft.sparkweave.api.util.modcompat.CompatHelper.ifEnabled(CompatHelper.java:28)
at knot//dev.cammiescorner.arcanuscontinuum.client.ArcanusClient.onInitializeClient(ArcanusClient.java:97)
at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:399)
... 9 more

A detailed walkthrough of the error, its code path and all known details is as follows:

-- Head --
Thread: Render thread
Stacktrace:
at net.fabricmc.loader.impl.FabricLoaderImpl.lambda$invokeEntrypoints$2(FabricLoaderImpl.java:403)
at net.fabricmc.loader.impl.util.ExceptionUtil.gatherExceptions(ExceptionUtil.java:33)
at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:401)
at net.fabricmc.loader.impl.game.minecraft.Hooks.startClient(Hooks.java:53)
at knot//net.minecraft.class_310.(class_310.java:458)