I don't know much about discord but if I'm right it's something like skype. We already have a teamspeak where factions can get there own private room with a password secure from anyone else all u have to do is ask an admin/owner to create one for you!
If you would like to join our teamspeak u can by going to the following address on teamspeak: ts3.mc-drugs.com If you don't have teamspeak you can download it here: http://www.teamspeak.com/