Question: Thunderspire Labyrinth is the second in the three part series of adventures introducing the new 4th edition "Dungeons & Dragons" concept of what, he adventure, was written by Michael Mearls, a writer and designer of fantasy role-playing games (RPGs) and related fiction?
Sentence (from "Thunderspire Labyrinth"): This module is set in a region of the world called the Nentir Vale, the details of which are given in the 4th edition "Dungeon Master's Guide".
Relevant evidence: No