[18:21:06] [Client thread/INFO] [laggoggles]: Loading mixin target class: net.minecraft.entity.Entity
[18:21:06] [Client thread/FATAL] [laggoggles]: Not all required mixins have been applied!
[18:21:06] [Client thread/FATAL] [laggoggles]: To prevent you from wasting your time, the process has ended.
[18:21:06] [Client thread/FATAL] [laggoggles]:
[18:21:06] [Client thread/FATAL] [laggoggles]: Required mixins that have not been applied:
[18:21:06] [Client thread/FATAL] [laggoggles]: - cf.terminator.laggoggles.mixin.MixinEntity targeting: net.minecraft.entity.Entity
[18:21:06] [Client thread/FATAL] [laggoggles]:
[18:21:06] [Client thread/FATAL] [laggoggles]: This means that LagGoggles will not function properly.
[18:21:06] [Client thread/FATAL] [laggoggles]: Make sure your versions are correct for Forge as well as SpongeForge.
[18:21:06] [Client thread/FATAL] [laggoggles]:
[18:21:06] [Client thread/WARN] [FML]: Java has been asked to exit (code 1)
[18:21:06] [Client thread/WARN] [FML]: Exit trace:
[18:21:06] [Client thread/WARN] [FML]: cf.terminator.laggoggles.mixinhelper.MixinValidator.validate(MixinValidator.java:53)
[18:21:06] [Client thread/WARN] [FML]: cf.terminator.laggoggles.Main.preinit(Main.java:33)
[18:21:06] [Client thread/WARN] [FML]: sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[18:21:06] [Client thread/WARN] [FML]: sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
[18:21:06] [Client thread/WARN] [FML]: sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
[18:21:06] [Client thread/WARN] [FML]: java.lang.reflect.Method.invoke(Unknown Source)
[18:21:06] [Client thread/WARN] [FML]: net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:637)
[18:21:06] [Client thread/WARN] [FML]: sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
[18:21:06] [Client thread/WARN] [FML]: sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
[18:21:06] [Client thread/WARN] [FML]: java.lang.reflect.Method.invoke(Unknown Source)
[18:21:06] [Client thread/WARN] [FML]: com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91)
[18:21:06] [Client thread/WARN] [FML]: com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150)
[18:21:06] [Client thread/WARN] [FML]: com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76)
[18:21:06] [Client thread/WARN] [FML]: com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399)
[18:21:06] [Client thread/WARN] [FML]: com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71)
[18:21:06] [Client thread/WARN] [FML]: com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116)
[18:21:06] [Client thread/WARN] [FML]: com.google.common.eventbus.EventBus.post(EventBus.java:217)
[18:21:06] [Client thread/WARN] [FML]: net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:219)
[18:21:06] [Client thread/WARN] [FML]: net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:197)
[18:21:06] [Client thread/WARN] [FML]: sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[18:21:06] [Client thread/WARN] [FML]: sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
[18:21:06] [Client thread/WARN] [FML]: sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
[18:21:06] [Client thread/WARN] [FML]: java.lang.reflect.Method.invoke(Unknown Source)
[18:21:06] [Client thread/WARN] [FML]: com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91)
[18:21:06] [Client thread/WARN] [FML]: com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150)
[18:21:06] [Client thread/WARN] [FML]: com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76)
[18:21:06] [Client thread/WARN] [FML]: com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399)
[18:21:06] [Client thread/WARN] [FML]: com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71)
[18:21:06] [Client thread/WARN] [FML]: com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116)
[18:21:06] [Client thread/WARN] [FML]: com.google.common.eventbus.EventBus.post(EventBus.java:217)
[18:21:06] [Client thread/WARN] [FML]: net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:136)
[18:21:06] [Client thread/WARN] [FML]: net.minecraftforge.fml.common.Loader.preinitializeMods(Loader.java:629)
[18:21:06] [Client thread/WARN] [FML]: net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:252)
[18:21:06] [Client thread/WARN] [FML]: net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:467)
[18:21:06] [Client thread/WARN] [FML]: net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:3931)
[18:21:06] [Client thread/WARN] [FML]: net.minecraft.client.main.Main.main(SourceFile:123)
[18:21:06] [Client thread/WARN] [FML]: sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[18:21:06] [Client thread/WARN] [FML]: sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
[18:21:06] [Client thread/WARN] [FML]: sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
[18:21:06] [Client thread/WARN] [FML]: java.lang.reflect.Method.invoke(Unknown Source)
[18:21:06] [Client thread/WARN] [FML]: net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
[18:21:06] [Client thread/WARN] [FML]: net.minecraft.launchwrapper.Launch.main(Launch.java:28)

see modlist below:
modlist.txt

Worth noting that a similar issue was opened that mentioned /dank/null and p455word lib as possible culprits but I had this working with no changes locally until today, and I have a server running with this same modlist that still does not crash on load.

Can you supply the latest.log and debug.log? This error cannot be solved without it

I know I didn't post on this issue but here is my latest.log for lag goggles talking about the mixins.
2019-11-18-4.log

Thank you for your log. Here's my findings:

[18:50:27] [main/INFO]: [com.pg85.otg.forge.asm.excluded.OTGClassTransformer:transform:77]: OTG-Core transforming: net.minecraft.entity.Entity : vg

is followed by:

[18:50:28] [main/ERROR]: Critical problem: mixins.laggoggles.json:MixinEntity target net.minecraft.entity.Entity was already transformed.

I suspect that OTG-Core introduced this, another candidate would be Astral Sorcery

OTGCorePlugin (OTG-Core.jar)
                                        com.pg85.otg.forge.asm.excluded.OTGClassTransformer

For more information, see: #71

Hope this helps!