In my modpack this skin and this skin only breaks the flashlight cone, for no apparent reason. It also changes how the colors of the world work...

The Wickerbeast doesn't have a cone. It uses a circle light around itself.
This should only affect itself tho.

Not sure what you mean with it changes how the colors of the world work, all it does is change the damage flash color to purple.
Sounds like you have another mod in there that isn't compatible with what this or CharacterModHelper does.

Then maybe there could be like an option to turn off this and make it a cone again? I'm trying to make like a horror like mod pack where it's dark and you only have your flashlight which doesn't really work with this

Alright, finally got annoyed enough to check the code and removing the flashlight entirely is quite simple actually