What could have been a normal, beautiful day is thoroughly ruined for Twilight Sparkle when her horn suddenly starts casting wild and uncontrollable spells. Life within Friendship Castle is quickly turned upside down while she searches for a cure.
This cure, however, turns out to be a lot different from what she expected.

Takes place during season 7.

Includes some head-canon about alicorns and their physiology.

Amber Starbright is a character from my previous story Twilight's first fan.
This is a sequel in only the broadest sense of the word, reading Twilight's first fan is not required to enjoy this one.