Imago was working in the Canterlot castle as a maid a few years prior to the actual Canterlot Wedding and first changeling invasion, under the alias of a earth pony mare. During that time, she befriended the young Princess Cadence and her coltfriend at the time, Shining Armor. With all the hustle and bustle with the return of Nightmare Moon and then shortly after Princess Luna, it wasn’t hard to find information about the Elements of Harmony, the one thing that could put a stop to the changeling army. After Twilight and her friends rush out of the castle to retrieve the Elements, Chrysalis reveals her plan to the bewildered Cadence, as well as her trump card: Imago.I may add dialogue later, but well, you know what happens after that