May I, the ignorant, ask what would be the purpose? Does it mean a voice chat, or messages?
My kids set up Discord for family conversations (we're spread out). And my son admins one related to a computer game. So I know generally what Discord does. Just curious what it would bring to fans of a miniatures game.
@andy: We too have a family one (for our weekly RPG stuff mainly), with my sons running a couple for their various gaming interests outside the house.
The best thing about Discord is that it is basically a web version of the old "chat rooms". The forums are good for the once a day "read, reply, post an idea" non-realtime style conversations we have here; but the realtime aspect of Discord (& the old IRC chatrooms it seems based off) allows for the kind of flowing conversation you get face-to-face. You are also alerted when people tag you directly (or address @everyone) in one of the chat rooms. The voice chat room feature though would be the primary differentiator. When gaming, you can chat to people hands-free and its particularly cool for "hang outs" whilst streaming (whether that be gaming or, say, miniature painting).
Oddly, compared to my more vocal "face-to-face" persona, I don't use the voice chat so much as (online at least) I like to take the time and get my entire thought out. Text lends itself more to that as there is no way to "interrupt" one another with text.