The Whisperian Crystals are very powerful objects used by The Trix in season 1 while in their search for the Dragonfire. These Crystals were used to locate and store the most powerful magical energies, such as the Dragonfire.
The Witches can use them to:
- Summon monsters (like the nightmare gargoyle)
- Watch over people and interfere with them using illusions of their own bodies (like in the simulator)
- Their most notable ability is to measure levels of magical energy in a being or object and steal it for the wielder of the crystal to use at a later time. The only magic known to reach the maximum magical reading is the Dragonfire.
Each of the Trix can summon a crystal. It remains to be seen if ordinary witches such as Mirta and Lucy have access to them. The crystals have not been seen since season one.