Vault of the Drow

Descent Into the Depths of the Earth is an adventure module for the Dungeons & Dragons ( D&D ) fantasy roleplaying game coded D1–2. It was written by Gary Gygax , and combines two previously published modules from 1978, the original Descent into the Depths of the Earth and Shrine of the Kuo-Toa . A sequel to the first two modules, Vault of the Drow , was also published in 1978. All of these D-series modules were produced for use with the 1st edition Advanced Dungeons & Dragons ( AD&D ) rules.