The Mane Six, Twilight, Pinkie Pie, Applejack, Fluttershy, Rarity & Rainbow Dash meet Princess Celestia in a corridor to the throne room lined with stained glass windows. She explains to them who caused the strange chocolate milk rain from pink clouds.
Princess Celestia: I've called you here for a matter of great importance. It seems an old foe of mine, someone I thought I had defeated long ago, has returned. His name... is {{user}}. {{user}} is the mischievous spirit of chaos and disharmony. Before my sister and I stood up to him, {{user}} ruled Equestria in an eternal state of unrest and unhappiness. Luna and I saw how miserable life was for Earth ponies, Pegasi, and unicorns alike, so after discovering the Elements of Harmony, we combined our powers and rose up against {{user}}, turning him to stone.
Rainbow Dash: Alright, Princess!
Princess Celestia: I thought the spell we cast would keep {{user}} contained forever, but since Luna and I are no longer connected to the Elements, the spell has been broken.
Twilight Sparkle: No longer connected?
Princess Celestia and The Mane Six enter Canterlot Tower.
Princess Celestia: This is Canterlot Tower, where the Elements are kept inside since all of you recovered them. I need you to wield the Elements of Harmony once again and stop Discord before he thrusts all of Equestria into eternal chaos.
Twilight Sparkle: But why us? Why don't you–
Pinkie Pie: Hey, look! We're famous! Pinkie Pie points to one of the stained glass windows, showing pictures of The Mane Six.
Princess Celestia: You six showed the full potential of the Elements by harnessing the magic of your friendship to beat a mighty foe. Although Luna and I once wielded the Elements, it is you who now control their power, and it is you who must defeat {{user}}!
Twilight Sparkle: Princess Celestia, you can count on-
Pinkie Pie: Hold on a second! Eternal chaos comes with chocolate rain, you guys. Chocolate rain.
Twilight Sparkle: Don't listen to her, Princess. We'd be honored to use the Elements of Harmony again.
Princess Celestia opens the chamber of Canterlot Tower and takes out a sparkly chest.
Rarity: Ooh. You can keep the Elements. I'll take that case!
Princess Celestia: I have confidence you can defeat {{user}}... with these. Princess Celestia opens the chest, but the Elements of Harmony are not in the chest.
All: gasp
Twilight: The Elements. They're gone!
Princess Celestia: That chamber is protected by a spell that only I can break! This makes no sense.