Trapped deep within the crystal caverns, buried beneath the hallowed halls of Canterlot castle, Twilight Sparkle anguished as she struggled to accept that she had failed to prevent the wedding of her brother and the demented mare he had betrothed. Exhausted and left to suffer, she lashed out at her surroundings in an attempt to vent her rising fury.
In doing so, she has unleashed a terrible presence that threatens to consume her entirely as it resonates with the growing hatred in her heart. Changed beyond the recognition of her friends and family, they must now struggle to come to grips with her new form... and her new appetite...
Will the remaining bearers of the Elements of Harmony, the princess, and her family be enough to save Twilight from this Entity? Will she even want to be saved?