A siege on Canterlot by an unknown type of seemingly hostile insectoid ponies reveals Twilight's true heritage, but really that raises more questions than it answers. Why do they seem to be coming directly for her? Why does another come, some weeks later, claiming not to be hostile, and in fact, her mother? Does any of this relate to the nightmares and migraines that she's been having for years now?

Anyone willing to do a cover image?

I would provide a more descriptive description of the whole story rather than just part of it, but I'm not very good at that. ><