It turns out that the Dean has determined (while the necklace and its higher-priority investigation have been unavailable to him) that the chalice actually enables its touched to make controllable visual illusions within a one-foot radius of themselves. But they haven't disseminated this information. They agree to cooperate with setting the trap - they release the chalice's real side effect, and a lie about its primary effect saying that it enables telekinesis. It is announced that it will be stored somewhere besides the university, and it is leaked to a few un-necklaced people when it will be loaded onto a car and driven away.