A Qaesitor binding is a binding cast by a djinn that is designed to find out what a person really hates and make it start coming out of his or her mouth. Frank Vodyannoy first used it on John Gaunt when he apprehended him for scaring Miss Pickings. It was then later used by John on Mr. Bilharzia to find out everything he knew about Dunbelchin, the camel that was used to find the tomb of Genghis Khan. It could be something harmless as in John's case, vegetables. Or it could include snakes, tarantulas, and even rats.