Captured, and starved of freedom, the former Queen of the Changelings is kept prisoner inside the dungeons of Canterlot under the authority of Princesses Celestia, Luna, and Twilight.
The longer she was held prisoner, the desire for her vengeance grew stronger.
Then, on one particular day, she soon gained a new inmate. One that was a species Chrysalis strongly hated but had the smarts and the manipulation skills to make up for it.
It didn't take Chrysalis long to understand that, despite the difference between age and species, they share one goal that would drive their motivation throughout their quest, and their lives: the joy of witnessing Twilight and her companions fall, and they would do anything to get to that point.