See more information at: https://www.spigotmc.org/resources/xpcommands.22782/
- PlaceHolderAPI - https://www.spigotmc.org/resources/placeholderapi.6245/
- PlaceHolderAPI Source - https://github.com/extendedclip
/xpc add <command> <cost>(L) - Adds a command with a cost to the list of commands
Example: /xpc add /god 20L
xpc.admin - Grants permission to use /xpc add
xpc.ignore - Ignore experience costs.