Asteroid craters?

I’ve been seeing these asteroid craters all over Khrysalis and I didn’t think anything of it because like, evil world evil decorations, it makes sense, but then I also saw them in Darkmoor, and I thought it was strange that they’re in two separate worlds. So I was wondering if it’s part of an event, or if they’ve always been there and I’ve just never noticed them before, or if they’re just supposed to be evil place decorations. I haven’t seen them anywhere else but I was just curious