There are hundreds of novels based on the role playing game Dungeons and Dragons. At first D&D was published by TSR, they got bought out by Wizards of the Coast in 1997. Novels are generally based in campaign settings of the D&D universe. However the novels are open to general audiences (you don't have to play the game to understand the novels.) The best selling settings are Dragonlance and Forgotten Realms, the other settins are: Birthright, Dark Sun, Eberron, Greyhawk, Kara-Tur, Mystara, Planescape, Ravenloft, and Spelljammer.
Ravenloft is a campaign setting for the Dungeons & Dragons roleplaying game. It is an alternate time-space existence known as a pocket dimension called the Demiplane of Dread, which consists of a collection of land pieces called domains brought together by a mysterious force known only as "The Dark Powers". Each domain is mystically ruled by a being called a "Darklord". Ravenloft is primarily a Gothic horror setting. Dungeon Masters are encouraged to use scenes that build apprehension and fear, culminating in the eventual face-to-face meeting with the nameless evil. Characters have a much greater significance attached to their acts, especially if they are morally impure, as they risk coming under the influence of the Dark Powers (through the game process called "dark powers checks") and gradually transforming themselves into figures of evil. The magical mists of Ravenloft could appear anywhere in the Dungeons & Dragons universe, drawing evil-doers (or player characters) into the Ravenloft setting.
Dungeons and Dragons: Birthright novels
Dungeons and Dragons: Dark Sun novels
Dungeons and Dragons: Dragonlance novels
Dungeons and Dragons: Eberron Novels
Dungeons and Dragons: Forgotten Realms novels
Dungeons and Dragons: Greyhawk novels
Dungeons and Dragons: Iconic Characters novels
Dungeons and Dragons: Mystara novels
Dungeons and Dragons: Planescape novels
Dungeons and Dragons: Ravenloft Novels
Dungeons and Dragons: Spelljammer Novels
Dungeons and Dragons: Comics and Graphic Novels
Spectre of the Black Rose - or buy at BN
Knight of the Black Rose - or buy at BN
I, Strahd - or buy at BN
Heart of Midnight - or buy at BN
I, Strahd: The War Against Azalin - or buy at BN
Shadowborn - or buy at BN
Tales of Ravenloft - or buy at BN
Vampire of the Mists - or buy at BN
Scholar of Decay - or buy at BN
Vampire of the Mists - or buy at BN
Death of a Darklord - or buy at BN
Dance of the Dead - or buy at BN
Tapestry of Dark Souls - or buy at BN
Carnival of Fear - or buy at BN
The Enemy Within - or buy at BN
Mordenheim - or buy at BN
Tower of Doom - or buy at BN
Baroness of Blood - or buy at BN
King of the Dead - or buy at BN
To Sleep with Evil - or buy at BN
Lord of the Necropolis - or buy at BN
I, Strahd: The Memoirs of a Vampire - or buy at BN
Heaven's Bones - or buy at BN
Mithras Court: A Novel of the Mists - or buy at BN