Thunderspire Labyrinth

Thunderspire Labyrinth is an adventure module for the core setting of the 4th-edition ruleset of Dungeons & Dragons.

"Beneath Thunderspire Mountain lies a sprawling network of mazes, tombs, and caverns collectively known as the Labyrinth of Lost Souls. In recent years, this vast labyrinth has become a living dungeon from which trade between the surface and subterranean worlds is possible. However, beyond the well-lit halls where prospectors, merchants, and traders convene lies a darker world where adventurers battle monsters and fiendish beings perform secret rituals for their dark masters.

H2 Thunderspire Labyrinth is a D&D adventure designed for heroic-tier characters of levels 4th-6th. It is the second adventure in a three-part series that began with H1 Keep on the Shadowfell and concludes with H3 Pyramid of Shadows. It can also be played as a stand-alone adventure.

This product includes an adventure booklet for the Dungeon Master, a player's booklet containing new character options and campaign information, and a full-color poster map."

Behind the scenes
While Thunderspire Labyrinth was designed initially for the "points of light" core setting of 4th edition, alterations to the adventure made in an article of Dungeon magazine made it possible to use it as a dungeon for characters in the Forgotten Realms. These changes included changing the focus on Vecna to that of Cyric and relocating Thunderspire Mountain to a geographical location in Faerûn near Cormyr.