Hello, first of all thanks for your time. Second, I have never had to post about an issue before.

below is the crash report....

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Time: 4/18/21 9:54 AM
Description: Initializing game

java.lang.NullPointerException: Initializing game
at net.minecraft.client.renderer.entity.EntityRendererManager.handler$zzn000$register(EntityRendererManager.java:683) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,xf:OptiFine:default,xf:fml:twilightforest:renderer,pl:mixin:APP:physicsmod.mixins.json:MixinEntityRenderDispatcher,pl:mixin:A}
at net.minecraft.client.renderer.entity.EntityRendererManager.func_229087_a_(EntityRendererManager.java) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,xf:OptiFine:default,xf:fml:twilightforest:renderer,pl:mixin:APP:physicsmod.mixins.json:MixinEntityRenderDispatcher,pl:mixin:A}
at net.minecraft.client.renderer.entity.EntityRendererManager.func_229097_a_(EntityRendererManager.java:104) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,xf:OptiFine:default,xf:fml:twilightforest:renderer,pl:mixin:APP:physicsmod.mixins.json:MixinEntityRenderDispatcher,pl:mixin:A}
at net.minecraft.client.renderer.entity.EntityRendererManager.<init>(EntityRendererManager.java:217) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,xf:OptiFine:default,xf:fml:twilightforest:renderer,pl:mixin:APP:physicsmod.mixins.json:MixinEntityRenderDispatcher,pl:mixin:A}
at net.minecraft.client.Minecraft.<init>(Minecraft.java:465) [?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterendforge.mixins.json:MinecraftMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.main.Main.main(Main.java:149) [?:?] {re:classloading,pl:runtimedistcleaner:A}
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_51] {}
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_51] {}
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51] {}
at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51] {}
at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51) [forge-1.16.5-36.1.4.jar:36.1] {}
at net.minecraftforge.fml.loading.FMLClientLaunchProvider$$Lambda$488/1423491597.call(Unknown Source) [forge-1.16.5-36.1.4.jar:36.1] {}
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-8.0.9.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-8.0.9.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-8.0.9.jar:?] {}
at cpw.mods.modlauncher.Launcher.run(Launcher.java:82) [modlauncher-8.0.9.jar:?] {}
at cpw.mods.modlauncher.Launcher.main(Launcher.java:66) [modlauncher-8.0.9.jar:?] {}

A detailed walkthrough of the error, its code path and all known details is as follows:
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– Head –
Thread: Render thread
Stacktrace:
at net.minecraft.client.renderer.entity.EntityRendererManager.handler$zzn000$register(EntityRendererManager.java:683) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,xf:OptiFine:default,xf:fml:twilightforest:renderer,pl:mixin:APP:physicsmod.mixins.json:MixinEntityRenderDispatcher,pl:mixin:A}
at net.minecraft.client.renderer.entity.EntityRendererManager.func_229087_a_(EntityRendererManager.java) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,xf:OptiFine:default,xf:fml:twilightforest:renderer,pl:mixin:APP:physicsmod.mixins.json:MixinEntityRenderDispatcher,pl:mixin:A}
at net.minecraft.client.renderer.entity.EntityRendererManager.func_229097_a_(EntityRendererManager.java:104) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,xf:OptiFine:default,xf:fml:twilightforest:renderer,pl:mixin:APP:physicsmod.mixins.json:MixinEntityRenderDispatcher,pl:mixin:A}
at net.minecraft.client.renderer.entity.EntityRendererManager.<init>(EntityRendererManager.java:217) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,xf:OptiFine:default,xf:fml:twilightforest:renderer,pl:mixin:APP:physicsmod.mixins.json:MixinEntityRenderDispatcher,pl:mixin:A}
at net.minecraft.client.Minecraft.<init>(Minecraft.java:465) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterendforge.mixins.json:MinecraftMixin,pl:mixin:A,pl:runtimedistcleaner:A}
– Initialization –
Details:
Stacktrace:
at net.minecraft.client.main.Main.main(Main.java:149) [?:?] {re:classloading,pl:runtimedistcleaner:A}
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_51] {}
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_51] {}
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51] {}
at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51] {}
at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51) [forge-1.16.5-36.1.4.jar:36.1] {}
at net.minecraftforge.fml.loading.FMLClientLaunchProvider$$Lambda$488/1423491597.call(Unknown Source) [forge-1.16.5-36.1.4.jar:36.1] {}
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-8.0.9.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-8.0.9.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-8.0.9.jar:?] {}
at cpw.mods.modlauncher.Launcher.run(Launcher.java:82) [modlauncher-8.0.9.jar:?] {}
at cpw.mods.modlauncher.Launcher.main(Launcher.java:66) [modlauncher-8.0.9.jar:?] {}

– System Details –
Details:
Minecraft Version: 1.16.5
Minecraft Version ID: 1.16.5
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 2135228200 bytes (2036 MB) / 5335154688 bytes (5088 MB) up to 8589934592 bytes (8192 MB)
CPUs: 12
JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx8G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
ModLauncher: 8.0.9+86+master.3cf110c
ModLauncher launch target: fmlclient
ModLauncher naming: srg
ModLauncher services:
/mixin-0.8.2.jar mixin PLUGINSERVICE
/eventbus-4.0.0.jar eventbus PLUGINSERVICE
/forge-1.16.5-36.1.4.jar object_holder_definalize PLUGINSERVICE
/forge-1.16.5-36.1.4.jar runtime_enum_extender PLUGINSERVICE
/accesstransformers-3.0.1.jar accesstransformer PLUGINSERVICE
/forge-1.16.5-36.1.4.jar capability_inject_definalize PLUGINSERVICE
/forge-1.16.5-36.1.4.jar runtimedistcleaner PLUGINSERVICE
/mixin-0.8.2.jar mixin TRANSFORMATIONSERVICE
/OptiFine_1.16.5_HD_U_G7.jar OptiFine TRANSFORMATIONSERVICE
/forge-1.16.5-36.1.4.jar fml TRANSFORMATIONSERVICE
FML: 36.1
Forge: net.minecraftforge:36.1.4
FML Language Providers:
javafml@36.1
minecraft@1
Mod List:
forge-1.16.5-36.1.4-client.jar |Minecraft |minecraft |1.16.5 |NONE |NOSIGNATURE
repurposed_structures-1.16.5-2.6.3-forge.jar |Repurposed Structures |repurposed_structures |1.16.5-2.6.3-forge |NONE |NOSIGNATURE
swingthroughgrass-1.16.4-1.5.3.jar |SwingThroughGrass |swingthroughgrass |1.16.4-1.5.3 |NONE |NOSIGNATURE
physics-mod-1.3.4_forge.jar |Physics Mod |physicsmod |1.0 |NONE |NOSIGNATURE
netherportalspread_1.16.5-5.1.jar |Nether Portal Spread |netherportalspread |5.1 |NONE |NOSIGNATURE
TrashSlot_1.16.3-12.2.1.jar |TrashSlot |trashslot |12.2.1 |NONE |NOSIGNATURE
projectvibrantjourneys-1.16.5-3.0.1.jar |Project: Vibrant Journeys |projectvibrantjourneys |1.16.5-3.0.1 |NONE |NOSIGNATURE
EndRemastered-R36.jar |End Remastered 3.6 |endrem |1.16.3 |NONE |NOSIGNATURE
valhelsia_structures-16.0.5.jar |Valhelsia Structures |valhelsia_structures |16.0.5 |NONE |NOSIGNATURE
areas_1.16.5-2.2.jar |Areas |areas |2.2 |NONE |NOSIGNATURE
ChunkAnimator-1.14.4-1.2.3.jar |Chunk Animator |chunkanimator |1.14.4-1.2.3 |NONE |NOSIGNATURE
towers_of_the_wild-1.16.4-2.0.1.jar |Towers Of The Wild |towers_of_the_wild |1.16.4-2.0.1 |NONE |NOSIGNATURE
villagespawnpoint_1.16.5-1.5.jar |Village Spawn Point |villagespawnpoint |1.5 |NONE |NOSIGNATURE
Patchouli-1.16.4-50.jar |Patchouli |patchouli |1.16.4-50 |NONE |NOSIGNATURE
Waystones_1.16.5-7.4.0.jar |Waystones |waystones |7.4.0 |NONE |NOSIGNATURE
EpicFightMod-1.16.5-3.2.0.jar |Epic Fight Mod |epicfight |1.0 |NONE |NOSIGNATURE
collective-1.16.5-2.25.jar |Collective |collective |2.25 |NONE |NOSIGNATURE
Clumps-6.0.0.21.jar |Clumps |clumps |6.0.0.21 |NONE |NOSIGNATURE
comforts-forge-1.16.4-4.0.1.0.jar |Comforts |comforts |1.16.4-4.0.1.0 |NONE |NOSIGNATURE
citadel-1.6.2.jar |Citadel |citadel |1.6.2 |NONE |NOSIGNATURE
TravelersBackpack-1.16.5-5.4.1.jar |Traveler's Backpack |travelersbackpack |5.4.1 |NONE |NOSIGNATURE
StorageDrawers-1.16.3-8.2.2.jar |Storage Drawers |storagedrawers |8.2.2 |NONE |NOSIGNATURE
betteranimals-1.15.2-5.5.0.jar |Cyber's Better Animal Models |betteranimals |5.5.0 |NONE |NOSIGNATURE
randomvillagenames_1.16.5-1.1.jar |Random Village Names |randomvillagenames |1.1 |NONE |NOSIGNATURE
elevatorid-1.16.5-1.7.13.jar |Elevator Mod |elevatorid |1.16.5-1.7.13 |NONE |NOSIGNATURE
InventoryHud_[1.16.2-1.16.5].forge-3.2.2.jar |Inventory HUD+(Forge edition) |inventoryhud |3.2.2 |NONE |NOSIGNATURE
DungeonCrawl-1.16.3-2.2.4.jar |Dungeon Crawl |dungeoncrawl |2.2.4 |NONE |NOSIGNATURE
guardvillagers-1.16.5.1.2.2.jar |Guard Villagers |guardvillagers |1.2.2 |NONE |NOSIGNATURE
RealisticTorches-1.16.5-3.1.2.jar |Realistic Torches |realistictorches |1.16.5-3.1.2 |NONE |NOSIGNATURE
Project_MMO-1.16.5-3.52.8.jar |Project MMO |pmmo |1.16.5-3.52.8 |NONE |NOSIGNATURE
ProgressiveBosses-2.2.0-mc1.16.x.jar |Progressive Bosses |progressivebosses |2.2.0 |NONE |NOSIGNATURE
iceandfire-2.1.6-1.16.4.jar |Ice and Fire |iceandfire |2.1.6-1.16.4 |NONE |NOSIGNATURE
BackTools-1.16.5-10.1.0.jar |Back Tools |backtools |10.1.0 |NONE |NOSIGNATURE
walljump-forge-1.16.4-1.3.7.jar |Wall-Jump! |walljump |1.16.4-1.3.7 |NONE |NOSIGNATURE
iChunUtil-1.16.5-10.2.0.jar |iChunUtil |ichunutil |10.2.0 |NONE |NOSIGNATURE
enhancedcelestials-1.0.4-1.16.4.jar |Enhanced Celestials |enhancedcelestials |1.0.4-1.16.4 |NONE |NOSIGNATURE
byg-1.1.14.jar |Oh The Biomes You'll Go |byg |1.1.14 |NONE |NOSIGNATURE
mysticalworld-1.16.4-0.3.1.10.jar |Mystical World |mysticalworld |1.16.4-0.3.1.10 |NONE |NOSIGNATURE
Paraglider-1.15.2-1.2.2.0.jar |Paraglider |paraglider |1.2.2.0 |NONE |NOSIGNATURE
firstaid-1.9.6.jar |First Aid |firstaid |1.9.6 |NONE |NOSIGNATURE
forge-1.16.5-36.1.4-universal.jar |Forge |forge |36.1.4 |NONE |22:af:21:d8:19:82:7f:93:94:fe:2b:ac:b7:e4:41:57:68:39:87:b1:a7:5c:c6:44:f9:25:74:21:14:f5:0d:90
cofh_core-1.16.4-1.2.1.jar |CoFH Core |cofh_core |1.2.1 |NONE |NOSIGNATURE
archers_paradox-1.16.4-1.2.0.jar |Archer's Paradox |archers_paradox |1.2.0 |NONE |NOSIGNATURE
Aquaculture-1.16.5-2.1.16.jar |Aquaculture 2 |aquaculture |1.16.5-2.1.16 |NONE |NOSIGNATURE
twilightforest-1.16.5-4.0.426-universal.jar |The Twilight Forest |twilightforest |NONE |NONE |NOSIGNATURE
betterendforge-1.16.4-1.5.1.jar |BetterEnd Forge |betterendforge |1.16.4-1.5.1 |NONE |NOSIGNATURE
corpse-1.16.4-1.0.6.jar |Corpse |corpse |1.16.4-1.0.6 |NONE |NOSIGNATURE
antiqueatlas-5.4.4-forge.jar |Antique Atlas |antiqueatlas |5.4.4-forge |NONE |NOSIGNATURE
xptome-1.16.5-v2.1.jar |XP Tome |xpbook |v2.1 |NONE |NOSIGNATURE
Launched Version: 1.16.5-forge-36.1.4
Backend library: LWJGL version 3.2.2 build 10
Backend API: NVIDIA GeForce RTX 3070/PCIe/SSE2 GL version 4.6.0 NVIDIA 466.11, NVIDIA Corporation
GL Caps: Using framebuffer using OpenGL 3.0
Using VBOs: Yes
Is Modded: Definitely; Client brand changed to 'forge'
Type: Client (map_client.txt)
CPU: 12x Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz
OptiFine Version: OptiFine_1.16.5_HD_U_G7
OptiFine Build: 20210305-003221
Render Distance Chunks: 12
Mipmaps: 4
Anisotropic Filtering: 1
Antialiasing: 0
Multitexture: false
Shaders: SEUS-Renewed-v1.0.1.zip
OpenGlVersion: 4.6.0 NVIDIA 466.11
OpenGlRenderer: NVIDIA GeForce RTX 3070/PCIe/SSE2
OpenGlVendor: NVIDIA Corporation
CpuCount: 12

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Things I have done is reinstall minecraft, that did'nt work so then i was thinking it was probably a mod conflicting, I then created a backup and started deleting mods one by one, I found out it is 100% a mod just not sure which one...

If i delete all the mods the game runs fine as is with just forge. My hunch is that it has something to do with a mod that manipulates mobs but again i'm unsure

Thank you for your time!