What first started out as a simple dare turns into a hellish nightmare as these groups of students find out the hard way that some things should be left untouched.
While exploring Canterlot Castle, Pinkie and Rainbow Dash uncover a room filled with stone tablets connected to dials. Above each dial is the name of an alicorn. These couldn't possibly control an alicorn's power, could they?
The princesses gave their magic to Twilight to prevent Tirek from stealing it. As a result, they end up stuck in Tartarus. The fact that things manage to go downhill here says a lot about the wonders of family.
With the help of her friends in Ponyville, the Tantabus was subdued...but what about Celestia? What about Luna's closest friend, a pony who had no idea what was going on in her little sister's mind?