These two royal alicorns: cunning sun and gullible moon, go about their childish conversations and attitudes whenever nopony is looking-- well, except for a certain Purple alicorn. And you're involved, too.
After a few romantic incidents and subtle attacks from a formidable villain, the Tree of Harmony's friendship map is extended, allowing a certain trio to tap into "unsuitable" areas once deemed to rot and burn under the verdicts of Luna and Celestia.
After the fall of the changeling hive, Twilight meets a new filly that has seen the Queen's whereabouts. Without wanting to alert the others, Twilight decides to go undercover with her new ally in search of the missing villain.