The Lair of Lazhir

Beneath the paved roads of Kargeviste, a great staircase bores deep into the endless labyrinthine caverns of the Underworld and punctures through the very roof of Hell. Miles above the burning eternal lakes of flame, there is an empty warren. Almost all find their end there on the damp stone bathed in pale blue fungal lights. A creature, 40 feet in length and covered with tumorous sores from which tendrils burst and flail, has earned a name amongst those who escape it: Lazhir. 
Mountains of treasure, taken as meaningless nothings by Lazhir who seeks the greater prize of flesh, are rumored to be somewhere within the monster's lair. A local merchant has sent word that he seeks brave adventurers, so that they might slay the creature and secure a delivery that never arrived.
The Lair of Lazhir is a full-length adventure dungeon that can create several sessions of gameplay, additional follow-up quests and stories, and provides hours of content.
The dungeon module contains several integrated adventures within it, 17 points of interest, 3 boss-level encounters with interactive gameplay mechanics for your party to utilize and figure out, and 3 NPC characters with realized backgrounds and motivations.