Mirror

A mirror, often looked at as a simple object, is in the magical world a powerful tool. Used to trap beings inside, look into the the future, telling the truth, etc...

Only one being is known for living in the "mirror world" which is the evil sorceress, Kali.

Magic Mirror of the Wicked Witch out Snow White
A very powerfull enchanted object, for a while it trapped the Wicked Witch (a very powerful evil witch that affected many fairy tales in history).

She was placed under the care of the Keeper of Fairy Tales. Unfortunately, the mirror fell off the wall and broke in 2002 and she was released. She immediately strangled and killed the keeper, and trapped his apprentice in the mirror. After Piper Halliwell vanquished the Wicked Witch, the apprentice was released and became the new keeper.