Mimi Core, a Spigot plugin that lets you create special zones called Deadzones using single-letter names from A to Z. These Deadzones can restrict what players can do in certain areas of your server.

Here's how to use it:

1. Set a Deadzone: Use /deadzone set A 250 to create Deadzone "A" with a radius of 250 blocks. Players without permission "mimi.mineA" won't be able to mine in this area.
   
   
2. Delete a Deadzone: If you want to remove a Deadzone, just type /deadzone del A. This will delete Deadzone "A" and players will regain access to that area.
   
   
3. List Deadzones: Want to see all the Deadzones you've set up? Simply use /deadzone list, and it will show you a list of them all.
   

Remember, Deadzone names must be single letters from A to Z, and don't include any numbers.

With Mimi Core, managing Deadzones on your server is easy and straightforward!