Alicorns are mystical and magnificent creatures, that much is clear. Yet what else are they? A mare who finds a mysterious book is left with many questions about alicorns. She turns to the only source from which she believes to get her answers.
The Crystal Empire has returned, along with its tyrant, King Sombra. It is up to Twilight to save the Crystal Empire, and she does exactly what is expected.
One mare can only take so much. Even if she is an alicorn, something has to give sooner or later, and when it does, something terrible and all-consuming will be unleashed. Twilight has reached the breaking point and arcane retribution is imminent.
In the blink of an eye, all life was wiped from the face of Equus by an abomination born of the stars. That is, all except for four immortal Princesses. Now they fight for the only thing they have left other than their grief... revenge.