Mayor Mare has sent Twilight Sparkle to open and manage a exhibit for a bit. She goes to the Crystal Kingdom to find some artifacts for the display cases, mainly crystals, and stumbles upon what looks to be King Sombra's horn! After returning to Ponyville, with the horn, strange things start to happen to Twi. She becomes rather obsessed with it, and feels different.

Special thanks to VitaSparks and JazzyQ!