Twilight Sparkle is an Alicorn: A Princess, An Immortal, A Goddess upon the mortal realm.
And as with all deities, she has gained those that pray to her. However, the personal and intense relationship between divinity and disciple is not something given out to just anyone.

Twilight Sparkle's first worshipper is the Element of Honesty herself, Applejack. Both mares will find just how deep their new bond goes. But Applejack will soon find herself and others becoming aware of how these bonds can shape and change the world: Because Twilight certainly isn't the only deity.