Buried at the end of the most recent update posted to the Shroud of the Avatar website is this note:

Changes to Chat

We’ve got a new chat server that is being hosted by the good folks at UltimaCodex. We’d like to thank our previous hosts at arg-irc.net for their generous support of the SotA chat server.

To use a dedicated IRC client, the server settings are: irc.ultimacodex.com, port 6667 (or 6697 for SSL), channel #SotA.

Please review the Forum Rules before participating in the Chat Room.

You can access the #SotA channel using the instructions above, or via this page at the Shroud of the Avatar website.