King of the Trollhaunt Warrens is the first-ever paragon-level adventure for 4th Edition Dungeons & Dragons. Designed to take characters from 11th to 14th level, this adventure pits the heroes against a variety of horrible monsters and fiendish foes as they seek to thwart the evil machinations of the denizens of the Trollhaunt Warrens.

This adventure can be run as a stand-alone adventure or as Part One of a three-part series of adventures that spans 10 levels of gameplay.