Alert: If you plan to use the mod on a server, clients are NOT required to download the mod, as its server-sided. If otherwise you are going to play singleplayer, then install the same version, it will work fine.
For example:
/roll 1d20+4 - Will roll a 20 sides dice then add 4 to final result and shows result to all players.
* Player rolled 1d20+4 and got: 24!
Reference:
