An essence flail is a device invented by Khaba the Cruel that usually impales the demon with an energy spike which can be used to swing them around.

Khaba tends to be rather loose with his use of the flail, using it at the slightest provocation on an any demon that he feels is misbehaving or not working up to standard. As such, Bartimaeus got the flail daily and eventually when making the decision of whether or not to misbehave again decided that "Once more won't make any difference."

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