So like a Ring Of dueling right?
Firstly Go to your client , add the options in for the item like
"wear"
"castle wars"
"duel arena"
Then go Compile W.e Run the client
Run the server
Then click on it and it will show in the Run.Bat << server runbat ofc
And the go to Clicking Buttons
make a new case .
And your Done Simple as that