Descent into the Depths of the Earth

The plot of the original modules Descent Into the Depths of the Earth and Shrine of the Kuo-Toa places a party of player characters (PCs) on the trail of the drow priestess Eclavdra through the Underdark, battling various creatures on their journey. In the last module in the preceding G-series, Hall of the Fire Giant King, the PCs were supposed to have discovered that the drow had instigated the alliance between the races of giants and their attacks on neighboring humans. The drow that survived the party's incursion have fled into tunnels leading deep into the earth. After traveling for league after league into the Underdark, the adventurers come upon Erelhei-Cinlu, the vast subterranean city of the drow. The adventure is written in a very open-ended fashion, giving the Dungeon Master (DM) free rein to script any number of mini-campaigns or adventures taking place inside the drow capital. An extensive overview of the drow power structure is given for just this purpose. Eventually, the players may discover an astral gate leading to the plane of the Abyss, leading into the Q1 module. ==Publication history==

The original modules Descent Into the Depths of the Earth and Shrine of the Kuo-Toa were both written by Gary Gygax and published by TSR, Inc. in 1978. Gygax had recently finished writing the ''Player's Handbook (1978), and according to Gygax, he authored the D series "as sort of a relaxation to get away from writing rules". Descent Into the Depths of the Earth, the first module of the D-series, was printed as a sixteen-page booklet, and Shrine of the Kuo-Toa'', second of the three-part D-series was twenty pages; both featured an outer folder. The modules were intended to function as a sequel for the G-series adventures. At the time these modules were released, each Dungeons & Dragons module was marked with an alphanumeric code indicating the series to which it belonged. The D in the module code represents the first letter in the word Drow. According to a Wired.com article, the D-series "introduced the world to the concept of the dark elves." Game statistics for the Drow first appear in the module, The D-series is part of a larger overall campaign of adventures set in the World of Greyhawk campaign setting. The overall campaign begins with the three modules in the G1–3 Against the Giants series, continues through the D-series, and concludes with module Q1 Queen of the Demonweb Pits. The latter segments of the campaign, including the D-series and module Q1, are set in a vast network of caverns and tunnels called the Underdark. The entire campaign was eventually combined into a supermodule GDQ1-7 Queen of the Spiders. Descent into the Depths of the Earth was the basis for a 2000 novel of the same title by Paul Kidd. The original TSR product codes for modules D1, D2, and D3 are 9019, 9020, and 9021 respectively (9021 being reused for the new Erol Otus cover with the blue background). ==Reception==

When combined with the G-series and Q module as the Queen of the Spiders, the D-series was voted the single greatest adventure of all time by Dungeon magazine in 2004. Reviewer Alan Kohler said, "The Underdark has become a classic place to set adventures... This is where it all got started." All three modules are also profiled in Heroic Worlds, Lawrence Schick's 1991 guide to role-playing games. Reviewer Anders Swenson reviewed the D1–2 Descent into the Depths of the Earth compilation in 1982 for Different Worlds #21. Swenson noted that purchasers of adventure publications had come to expect longer texts for the given price, so that the two adventures had been combined into one format; redundant text was eliminated, and new illustrations were added to fill the resultant gaps in layout. He was perplexed by all of the creatures found in the grand cavern area originally found in module D1: "All these creatures are apparently expected to do nothing but sit in their caves and wait to be attacked, for they would certainly defeat any moderately tough adventurer party specified by the author if they all tried a massed and well-coordinated attack." Francesco Cacciatore for Polygon commented in 2025 that "This natural dungeon/ecology factor is on full display in D1 and D2, where the real antagonist is the Underdark. However, modern players should not expect something as detailed and nuanced as Out of the Abyss. This is essentially a hexcrawl populated with deadly random encounters, as well as some fixed encounters designed to advance the story." ==References==