Disable Elytra Outside The End

The mod does what it says in the name (+ more)

Features

• Use /deote command to modify config in-game (or GUI if playing with LAN)
• Change working dimensions via dimensionList parameter
• Change allowed flight items via itemList parameter (with Curios compat)
• Configurable messages when flight or firework boosting is prevented
• Prevent player without this mod from joining to server

TODO:

• Spigot/Paper plugin (why not)

I'm not planning to backport mod to <1.21.1, since networking got changed and I don't want to get into it.

But source code is open, so you can do it by yourself.

It's not recommended to use v1.x, since it's buggy and terrible.