Twilight is sent to find the Sculptor for a friendship lesson, however her interaction with the gorgony gives Twilight more insight on the species as well as the Sculptor's tragic background.
"Mocha" was a human in a dangerous deadly war, now he's pony in peaceful Equestria... But the time between the end of his life as a human and the life of peace he now has as a pony was not easy to obtain. War and peace; nothing comes easy to some.
When you dream, it's not always real. It's not the case here because for some reason Twilight Sparkle and her friends were in a place in Twilight's dream.
After being exiled from all of Equestria for a crime of conscience, and with all memory of her erased, Twilight attempts to force herself back into the public eye, and expose the truth about Celestia's noble goals...