No Peace with Kobolds: The Duergar Slave Pits

From the introduction: Survivors of the attacks on Greenest attempted to establish a new village far from the clutches of the Dragon Cult. Little did they know that their new home was located next to a new entrance into the Underdark. An uneasy truce is then threatened when the kobold leader Kignos, along with the entire town council of Greyrun, is taken prisoner by Duergar slavers. The soon to be signed peace treaty is put to the test when kobolds threaten to attack. A 4-6-hour adventure for 5th-6th level characters.