For Rarity the mirror has become an instrument of torture. Everything she runs across is a reminder of the inevitability of old age and loss of her beauty. Convinced she can keep her youthful looks, she ventures into the EverFree Forest for answers. During a chance encounter with a mysterious pony, her wish is granted. However, Rarity is changed into a vampire, who's sole purpose is feeding her bloodlust. However she is not the greatest threat. The mysterious pony Rarity had come across is an ancient evil, merely using Rarity as a puppet and who is bent on the elimination of the Royal Sisters and conquest of Equestria.