Principal Revenant spying on Monster High
Crystal Balls are magical objects that are used to gain information such as predicting the future, projecting themselves to another location, for communication, and see faraway places. Crystal Balls are mainly used by Mages but they can occasionally be used by Ghosts.
Monster High[]
The coach of the West Valley High casketball team used a Crystal Ball to predict the other team's moves and win. The Monster High fearleading team realized the West Valley Mages were cheating to win, so they made enough noise to destroy the Crystal Ball and win. [Source]
Principal Revenant had a Crystal Ball in her office which she used to communicate with her students by projecting an image of her head and spying on Monster High. [Haunted]
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