Discord is currently the primary means of communication used by the Dark Jedi Brotherhood. Discord allows members to chat using text and voice using a range of devices such as mobile devices, tablets, or computers.
A list of rules and regulations for official Brotherhood Chats can be found on the Wiki. Note that rules and regulations for Clan Channels are maintained by their respective Clans Summits.
A link to join the Dark Brotherhood Discord can be found after logging in.