The Mirror Spirit is a fairy-like creature that doubles the worth of Dream Stones you gather. When you hit a bubble containing a Mirror Spirit, the Mirror Spirit appears, the spirit is freed and Dream Stones will sparkle. Each stone you pick up in this state is worth twice as much as a regular stone.
Once upon a time, there was a Mirror Spirit who loved to play tricks. The spirit would take things and put them in front of the mirror. This confused people, since it made things look twice as large. Then one day, the Mirror Spirit made a reflection of the sun that was twice as large, and drove away night. People couldn't sleep or dream because there was no more night. The spirit had gone too far this time with its tricks. The spirits were so angry that they imprisoned the Mirror Spirit.