Question: Swords of the Undercity is part of the Dungeons and Dragons game that uses a fictional city for the stories created by which author?

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CA module series: The CA module series is a series of two adventures for the "Dungeons & Dragons" role-playing game, designed to be compatible with the "Advanced Dungeons & Dragons" first edition. " Swords of the Undercity" (CA1) was written for character levels 8–12 by Carl Smith, Bruce Nesmith, Douglas Niles and published in 1985. " Swords of Deceit" (CA2) was written for character levels 10–15 by Stephen Bourne, Ken Rolston, Steve Mecca, and Michael Dobson and published in 1986.

Arcanis: Arcanis was originally a campaign setting for the Dungeons & Dragons game, created by Henry Lopez and supported by Paradigm Concepts.  It is also the name of the fictional world where the setting takes place.  The setting was launched in 2001 and is known for its odd twists on the fantasy genre, as well as its wide member approval and community-based design and construction.  Unlike many other fantasy roleplaying games, which focus primarily on tactical combat, the Arcanis campaigns focus on moral ambiguity and politics.

Darrin Drader: Darrin Drader (born April 30, 1973) is a writer who works in the narrative, game design, and video game fields.  He has over 50 published credits and has contributed to several noteworthy books for the Dungeons and Dragons game by Wizards of the Coast.  He has also made notable contributions to gaming products by other game publishers, such as Paizo Publishing, Bastion Press, and Gun Metal Games.  He later worked as a narrative designer for the video game company 38 Studios.

Dungeons &amp; Dragons Online: Dungeons & Dragons Online ("DDO") is a massively multiplayer online role-playing game (MMORPG) developed by Turbine for Microsoft Windows and OS X.  The game was originally marketed as "Dungeons & Dragons Online: Stormreach", then renamed "Dungeons & Dragons Online: Eberron Unlimited" upon switching to a hybrid free to play model, and was finally rebranded "Dungeons & Dragons Online", with the introduction of Forgotten Realms-related content.  Turbine developed "DDO" as an online adaptation of "Dungeons & Dragons" ("D&D"), based loosely on the "D&D" 3.5 rule set.  The game is set on the unexplored continent of Xen'drik within the Eberron campaign setting, and in the Kingdom of Cormyr within the Forgotten Realms campaign setting.

Dungeons &amp; Dragons Adventure Game: The Dungeons & Dragons Adventure Game is the name of two companion accessories to the second and third editions of the "Dungeons & Dragons" fantasy role-playing game.  Designed as simpler, stand-alone versions of "Dungeons & Dragons", they feature a simplified ruleset, but with character progression that parallels the standard game.  However, for 3rd-level characters and higher, the standard "Player's Handbook" is still required.  The first version was published in 1999 for the second edition of "Advanced Dungeons & Dragons", while the second version was published in 2000 for the third edition of "Dungeons & Dragons".

Worldwide Dungeons &amp; Dragons Game Day: Worldwide Dungeons & Dragons game day is a promotional event for the Dungeons & Dragons role playing game.  Game stores in over 40 countries host games throughout the day, including a special free adventure with pre-generated characters from Wizards of the Coast.

Swords of the Undercity: Swords of the Undercity is a 1985 adventure module for the "Advanced Dungeons & Dragons" fantasy role-playing game, for the Lankhmar setting.

Moradin: Moradin is the chief deity in the dwarven pantheon in the Dungeons & Dragons game and is a member of the default D&D pantheon.  In 3rd edition, Moradin's domains are Creation, Earth, Good, Law, and Protection.  The 5th Edition "Players Handbook" include Knowledge as a suggested domain.  His titles include Soul Forger, Dwarffather, the All-Father, and the Creator.  He created the first dwarves out of earthen materials and tutored them in dwarven ways.

Lankhmar: Lankhmar is a fictional city in the "Fafhrd and the Gray Mouser" stories by Fritz Leiber.  It is situated on the world of Nehwon, just west of the Great Salt Marsh and east of the River Hlal, and serves as the home of Leiber's two antiheroes.

Dungeons &amp; Dragons Game (1991 boxed set): The New Easy-to-Master Dungeons & Dragons Game is an introductory set for the "Dungeons & Dragons" fantasy role-playing game, published by TSR, Inc. in 1991.  It was a replacement for the previous "Dungeons & Dragons Basic Set", serving to introduce new players to the game, using the rule set previously established.

Supporting paragraphs: Swords of the Undercity Lankhmar
Answer: Fritz Leiber