After the events of The End of Time, the Master, with the help of Discord arrives in Equestria, one day before the return of Nightmare Moon, and meets The Great and Powerful Trixie Lulamoon (or just Trixie), a unicorn pony that is a big boast, who runs a magic show in a world which magic already exists.
Together, they shall build their plans for complete control over the universe, and shall terrorize infinite civilizations. Just wait, because... Here. Come. The drums!
Story simultaneous to : https://www.fimfiction.net/story/301098/tales-of-the-blue-box
Note : Cover art found on google.