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The Grusom-daj is an ogre mind trick that can cause a lot of pain by transmitting a high-pitched frequency. It reportedly feels equivalent to a tuning fork being struck inside the victim's brain.

Appearances Edit

Book 3: Everblaze Edit

King Dimitar appeared at Kenric's funeral, and after Sophie poked around in his head, he used the Grusom-daj mind trick on her and her friends. For some reason, probably due to her genetics, it did not affect Sophie, but it did affect all of her friends.

Book 6: Nightfall Edit

King Dimitar promised not to use the Grusom-daj on Keefe when they were sparring.

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