It was the first story mission; they'll patch in a hard mode later:

The Minstrel's Ballad: Queen of the Night

How about more?

"Sombra is back, summoned with a big pile of crystals!" The Frozen North (Extreme)

"Tirek escaped from Tartarus again, and found a stronger source of magic before moving on Equestria!" Ponyville Outskirts (Extreme)

"Starlight Glimmer wants to spar with you before we go up against the Changeling army." Temporal Anomaly (Hard)

"This is the stained glass window dedicated to the defeat of the Changelings. *Seeing this stained glass window brings forth memories...*" The Twisted Hive (Savage)