Apple Bloom keeps a journal. In it, she writes about two ponies she could never see but longs to speak with.

A more dramatic version of it.

A time in the sister's lives before Luna went evil.

Shining is soooo smart

Stealing cookies.

Who was Twilight before her adventure began?

A brief meeting with King Sombra in his timeline

She asks her mentor a question which seems impossible to answer.

Well seems like Twilight's mean double managed to escape before the Tree of Harmony could get to her. As she plans to just travel along the way she meets king Sombra.

To another dreary day, the king of the Crystal Empire transpires something unexpected.