This story is a sequel to The Adventures of Flare Brimstone
(This is a continuation of Chapter 10's of the Adventures of Flare Brimstone, and it isn't needed to read the chapter in order to understand.)
Whilst patrolling around Canterlot Castle, Agni, a bat pony and special guard of five that protects Princess Celestia's life from the shadows, has been harried by his new friend Flare Brimstone to show the mare a unique type of magic that only he, Celestia and a select few individuals can use called Incantation.
Deciding to oblige in the fervent requests, or just stop Flare from asking for some peace, Agni leads the mare to a tower where the stallion trains in the ancient magic.