In the shop of the adventurous bat pony Flare Brimstone, an agent of Princess Celestia, many trinkets and objects adorn the shop top to bottom; rarites. They all have some facet of a story to tell. And Twilight Sparkle would like to know.
Through rigorous, incessant requests made by Flare Brimstone, Agni has been left with no other choice but to oblige in the mare's curiosity about incantations, to whom Agni is quite adept in, to explain what they are and how to use them.