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.
Luna has finally had enough- Celestia's constant ribbing over the years reaches its peak when she accuses the Lunar Princess of having no sense of humour. Luna's humour is just a little 'dated', that's all...
After starting the day by raising the Sun, Celestia was sure that nothing could possibly ruin her day. Unfortunately for her, something had happened to her sister. She really thought Luna would have learned after the last time.