The Sith were the dark side equivalent of the Jedi. Millennia ago they were very numerous but for the last several hundred years they barely existed at all and we thought they were extinct until recently
Like the Jedi they would build outposts or shrines at places where the Force was particularly concentrated. Places of power I guess you could say. From what I'm seeing below it seems something like it has arrived here. If I'm incorrect in my assumption then I'm happy to be so, but otherwise I wondered if I could be of help.