The Jade Pyramid stored all the energy of the spirits that Iblis attracted in The Day of the Djinn Warriors to gather into one place. This would ultimately power his Enantodromian wish to turn all good wishes into negative ones.
Prior to the plot, there was notable amounts of jade noted to be stolen from museums across the world. Mundane newspapers reported this mysterious occurring, but it was unknown who was behind it. It was later Iblis himself that reveals that he was the thief in question. Part of the reason for the selection of jade, it is a weakness and powerful binding factor of even powerful djinn] from the Marid tribe that would render them helpless to stop his plan.