I think that a Discord server would be much better to communicate with than anything this site has to offer.
First, the best thing we can communicate with here is the Discussion panel. Most new users don't check here, and some editors probably don't either. However, a Discord server would be easier to check because of how widely used Discord is. Before you say that some users might not have Discord, the link to the official Arcaea Discord is on the front page. Would it be too difficult to add one of our own?
Second, Discord has many functions that we could benefit from. Roles can be useful for people to find who to ask if they have a question, and can also give some people a sense of accomplishment for getting a certain role, therefore promoting making edits. Also, having a channel for casual chatting, one for posting scores/accomplishments, and one for serious discussion would also be useful.
Finally, a Discord server would be much easier to promote in comparison to a wikia. You can invite anyone easily with a link, including people who don't have the game. What's the point of inviting people without the game? Well, they might start playing it out of interest, albeit it's very unlikely. As I stated earlier, we could easily add an invite link to the discord on the front page, right next to the official Discord.
TL;DR: Having a discord for the wiki would be very useful and much better than anything this site currently has to offer for communication.