the backstory of Queen Chrysalis that will change Equestrian history forever

Kayla thought she was a normal girl but when she revives a strange gift she is transported to equestria and her world is turned up-side down will she be equestria's savior or its destroyer

After one night Sunset's memory is erased completely. Her friends need to try and do whatever they can to help her... but will they have time before it is too late? And the memory stone was broken too right? (Story set after the Forgotten Friendship)