World presets to allow players to choose between multiple world options for your modpack. Presets can have descriptions and images to make the different options very clear to the player. Presets can also be locked by default, and unlocked with a command, allowing for certain presets to be locked behind an advancement, quest or the Prestige mod.
Custom world creation screen.
Set a custom void world spawn structure.
Set fog color with celestial angle color transition.
Set custom skybox with celestial angle image transition.
Enable short-distance spherical fog like in the vanilla nether.
Set a static celestial angle for permanently day, night, sunset, etc.
Disable sky rendering altogether.
Make single biome dimensions.
Modify the brightness of light.
Add effects such as attributes modifiers or damage in a certain light level to entities.
Force initial difficulty.
Run initial command functions on the player when they join the world.
Run initial command functions on the server when the world is first created.