Expedition to the Demonweb Pits

Expedition to the Demonweb Pits is an adventure module for the version 3.5 ruleset of Dungeons & Dragons for the core setting.

"A D&D super-adventure that can be played as a mini-campaign or a series of small side adventures.

Expedition to the Demonweb Pits is a D&D super-adventure for characters of levels 9–12. It is usable as a mini-campaign on its own, as a story arc in a Dungeon Master’s regular campaign, or as a series of small side adventures with a big payoff. The structure is very flexible and eminently customizable. The adventure uses a new combat encounter format designed to make the DM’s job easier and to speed up play.

Heroes who become entangled in the adventure’s plot soon find themselves squaring off against the agents of Lolth and Graz’zt across several planes, including the Abyss."

- Description from Wizards of the Coast website