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Use JSON. https://github.com/MinecraftForge/MinecraftForge/blob/1.15.x/src/generated/resources/data/forge/tags/items/arrows.json

If you haven't made any config changes delete your config folder

Oh geez, I somehow didn't notice the "External Libraries" section in Intellij's sidebar underneath the project. I was too busy looking at the folders inside the project. This is what I get for trying to learn my way around a new IDE and a new set of libraries all at once. Thanks for pointing that out, as well as letting me know which libraries in the list to look at. I also found the event bus code, and along with the explanation, it's making a lot more sense to me now. It's one big object keeping a map of all listener methods to the objects they're listening to. Edit: Thanks to everyone's help, I was able to register a PlayerLoggedInEvent listener with the EVENT_BUS and got my "Hello World!"

Thanks for the amazing work, it was such a fast release!

Create an Enum Class that implements IItemTier and copy everything from ItemTier and define your custom material type It can be done like this