The Stimulating Compass is a spell used by magicians on demons who do not follow the orders of their master. The spell causes lightning to erupt from the 5 corners of the pentacle and attack the demon inside. This spell, just like any other spell, can be reversed by the demon if the demon in question knows the magician's birth name.
Nathaniel once used the Stimulating Compass on Bartimaeus. At that moment, Bartimaeus, trying to appear manly and intimidating, was in his shirtless guise, with ripped biceps, a broad bare chest and six-pack abs, and hands rested casually behind his head. As Nathaniel cast the spell, Bartimaeus was taken by surprise. Five bolts of electricity shot up and hit him square in his muscular bare-chest, stomach and his broad back. Arcs of electricity coursed over Bartimaeus's muscled, bare-chested body, and the force of the charge was so great that Bartimaeus was actually lifted off his feet, yelling in agony. For a while, Bartimaeus endured the electric shock, gritting his teeth and trying not to show Nathaniel that the shock was hurting him more than he liked to admit, for Bartimaeus never liked to give up in defeat and bow down before magicians-it hurt his pride. But, Nathaniel continued to torture him with electric shocks, and watched gleefully as tendrils of electricity coursed over Bartimaeus's bare chest, and saw Bartimaeus struggling to endure the shocks but failing. Nathaniel then proceeded to shoot extra bolts of lightning , hitting Barimaeus in his abs and stomach, zapping him all the more with electric shocks. By this time, Bartimaeus had just about enough. Even as he was being zapped with electricity, he managed to murmur Nathaniel's name through gritted teeth and performed the Counter-curse. Instantly, the spell left him, and he slumped back into the floor, smoke curling from his singed trousers and his bare chest.
According to Bartimaeus, he had been on the receiving end of the Stimulating Compass countless times before, and the magicians took great pleasure in seeing the ever-confident, cocky, quick witted Bartimaeus airborne, writhing in agony, as they electrocuted him.