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A SUCCUBUS WITH AN UNQUENCHABLE LUST FOR POWER IS TURNING THE CAGE INTO A RIPPING MADHOUSE¸ AND THE LADY OF PAIN AIN'T PLEASED.... Somthing's foul in Sigil¸ berk. A mad slasher prowls the streets¸ leaving a trail of bloody clues in his wake. Leatherheads boldly court the Lady of Pain¸ longing for the sharp touch of her shadow. Even the silent dabus're acting barmy¸ a sure sign that the Lady herself is uneasy. Are these strange events tied to a madhouse full of spell-touched sods ready to slip the bonds of mortality? A curious body'd better step carefully. After all¸ the dead-book's full of fools who wished for power - or got in the way of another berk's wish. Harbinger House is a PLANESCAPE adventure for four to six characters of 4th to 7th levels. From Sigil to the Outlands and back again¸ the heroes must piece together a puzzle that could shake the Cage to its foundations. A dark secret of the multiverse waits to be discovered in the lunatic asylum called Harbinger House¸ and only the player characters can shape its power - for good or ill. The PLANESCAPE Campaign Setting boxed set is required to run this adventure. The PLANESCAPE MONSTROUS COMPENDIUM Appendix¸ In the Cage: A Guide to Sigil¸ and A Player's Primer to the Outlands are recommended to enhance your enjoyment of this adventure.