The Pillar of Zech is a quasi-Masonic secret society that exists throughout the continent of Laurentia. The goals of the Pillar are the active promotion of the Seven Princely Virtues (courage, honour, independence, intelligence, integrity, piety and revenge) across the world.
A great treasure has been stolen from the Palace and taken to the nearby Temple to the Bitch-Goddess Atrath Klee. The King demands that the party go and retrieve it - the only snag is that the Temple is guarded by potent magic that will kill any male who steps inside. It's just as well that the King has a stash of Girdles of Gender Alteration for just this circumstance.