The party is driven west by the pull of the remaining baneblades.
As they continue they encounter the last vestiges of an ancient stronghold of a mad wizard, buried deep below the City of Waterdeep. One of the blades may be located deep within its twisted passages, through one of many portals in the Undermountain that lead to another realm, and a shocking secret that may be more than the party can handle.
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What happens when you throw together the heroes of Waterdeep, a wandering drow outcast, two matrons and their ilk, and a party of heroes from Phlan that turned on each other years ago?
In the face of an onslaught of demonic wolf-spiders? Partners.