From the publisher:
Born of anger, resentment and corruption, the Harpies of Pazuzu’s Fury lure the unsuspecting and weak willed to gory ends under tooth and talon. Their devotion to Pazuzu - the prince of winged demons - grants them horrific powers yet fuels an appetite that can be assuaged but never satisfied. Fear the rising of the blood moon, when the harpies take wing. Close your ears to their sweet song, for it brings naught but death. Pazuzu’s Fury includes:
Six new feats
Six new spells
Three new magic items used by powerful tribal members
Ten stat blocks (ranging in CR from 4 - 10)
Full details of the tribe’s guardian demon - the Corrupting Aspect of Pazuzu
Numerous adventure hooks to use Pazuzu’s Fury in your campaign