This may be obvious to others, I don't know. I was just thinking about how Mavra spoke of it, and it didn't sound like a single event, meaning the first time. I'm thinking that the Stars and Stones is a repeating event, when something big happens. Kind of like how on Halloween you can kill Immortals. But the Stars and Stones is a much much bigger type of event.
What do you all think? If the theory is true, what kind of event do you think it would be that repeats itself, and how often? I'm guessing it's something that happens every thousand years, or maybe even more years than that.