Custom Unlockable Dimensions

⚠️

You need to learn how texture pack and datapacks works!

Create a Datapack

Follow the tutorial on the Minecraft Wiki on datapacks on how to set one up, use the namespace from earlier
You can lock any dimension from any mod, or even vanilla minecraft.
Create a new .json file in the path

data/(namespace)/locked_dimension/(dimension_name).json

{
 "dimension": "(dimension:id)",
 "stack": "(item stack codec)"
}

Replace the (dimension:id) with the name and mod id for the dimension you want locking.
If you are not sure what item stack codec is, you can google it OR ask in the AIT discord server!
Now put this datapack into Minecraft.