
Tiamat is further detailed as a deity in Defenders of the Faith (2000) and Deities and Demigods (2002). She is also referenced in Faiths and Pantheons (2002) from the Forgotten Realms campaign setting.
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This information is later included in the Manual of the Planes (2001). Tiamat appears in a preview article for the third edition, in Dragon #272 (June 2000). Several draconic children of Tiamat are described in the article "Spawn of Tiamat, Children of Bahamut," in Dragon #260 (June 1999). Her role in the cosmology of the Planescape campaign setting was described in On Hallowed Ground (1996). Tiamat is also described in Cult of the Dragon (1998). Tiamat was later detailed as a deity for the Forgotten Realms campaign setting in the original Draconomicon (1990). Tiamat was detailed as a deity in the book Monster Mythology (1992), including details about her priesthood. : 80 Advanced Dungeons & Dragons 2nd edition

In module H4 The Throne of Bloodstone (1988), Bahamut tells the player characters that the Wand of Orcus can only be destroyed if it is "steeped in the black and foul blood from the heart of Tiamat, the Queen of Darkness", although if killed Tiamat and the wand will be removed from the current plane of existence for centuries, but will eventually return to existence. Tiamat's role in the outer planes is detailed in the first edition Manual of the Planes (1987). Tiamat's role as ruler of Avernus, the first layer of the Nine Hells, is detailed in Ed Greenwood's article, "The Nine Hells Part I", in Dragon #75 (1983). In the first edition of Deities & Demigods (1980) she is mentioned under the entry for the Babylonian god Marduk ("His battles with Tiamat are legendary."), formally connecting her with the Babylonian Tiamat. Tiamat, the Chromatic Dragon, Queen of Evil Dragonkind, is further described in Dragon #38 (1980). In this book, the Chromatic Dragon was given the personal name, "Tiamat" and is stated to rule "the first plane of the Nine Hells where she spawns all of evil dragonkind". The character appears in the first edition Monster Manual (1977). She was described as she is now, but she did not yet have a personal name. In this book, she was only known as "the Dragon Queen" and "the Chromatic Dragon". The character was introduced to the game in its first supplement, Greyhawk (1975), by Gary Gygax and Rob Kuntz.

1.3 Advanced Dungeons & Dragons 2nd edition.
