This plugin will do several things. But the main picture is a 1v1 arena plugin
There will be a lobby defined by a region flag (/setlobby region name). And within the lobby, you will have certain items signifying what type of fight you can do. (When entering the lobby, your inventory saves and cleares, and is given back to you when you exit the arena). When you right click a player with the designated item you wish to fight them with (stick, blazerod, soup.. etc) it will aware them that you wish to fight them with that fight type. If they click