When Twilight Sparkle meets Bookins she is shown a world where love doesn't fix everything, friendship isn't magic and happy ever afters never happen.
Through him she also finds she possess a magic ability more powerful then any other and about her family's dark past and how they really came to be at Canterlot.
From the findings of influential pegasus Leony which uncovers an ancient forgotten war that turned much Equstria to ashes and almost wiped all of pony-kind to
impossible romances between the most violent and dangerous and the most gentle and caring and much more besides