Diablo refers to a series of three ARPG's, or "hack'n'slash" games, owned and developed by Blizzard Entertainment, a series of nine related novels, two comic book series, and a pen and paper RPG all set in the same gothic-horror themed universe.

Diablo refers to a series of three ARPG's, or "hack'n'slash" games, owned and developed by Blizzard Entertainment, a series of nine related novels, two comic book series, and a pen and paper RPG all set in the same gothic-horror themed universe. The main narrative of the Diablo universe is set against the backdrop of a millenia long conflict between the Angels of the High Heavens, and the Demons of the Burning Hells. The Human world of Sanctuary is positioned squarely between the two warring planes, and is the primary location for most of the tales of the Diablo universe.

The three games that form the most widely known narratives in the Diablo universe are Diablo (1996) and its expansion Hellfire (1997), Diablo II (2000) and its expansion Lord of Destruction (2001), and Diablo III (2012) and its expansion Reaper of Souls (2014).

The series of games has sold over 24.8 million copies as of May 30th, 2012. Diablo III has been certified as the fastest selling PC game of all time, selling 3.5 million copies on its release day of May 15th, 2012. In each game, the player assumes the role of a "nameless hero," and adventures around the world of Sanctuary fighting the forces of evil: undead, wild beasts, cultists, and Demons. During these adventures, the player is even called upon to fight the seven Lords of Hell: Duriel, Andariel, Belial, Azmodan, Mephisto, Ba'al, and Diablo himself.

In order to more fully flesh out the tales of the Diablo universe, a total of nine novels have been written: an origin story trilogy titled The Sin War; a post-Sin War tale was released as an e-book titled Demonsbane; the novelization of Diablo, known as The Black Road; the two part novelization of Diablo II, titled Legacy of Blood, and The Kingdom of Shadow; the sequel to Kingdom of Shadow, titled Moon of the Spider; and a prequel of Diablo III, known as The Order. An in-universe encyclopedia has also been released, called Diablo III: The Book of Cain.

In addition to the PC games and novels, two comic series' and a pen and paper RPG set within the Diablo universe have been released. A single comic book, Tales of Sanctuary, published by Dark Horse Comics was released in 2001, which contained three stories: Rage, The Hand of Naz, and Hatred's Bride. In November, 2011, DC Comics released the first part of a five part mini-series titled Sword of Justice. The pen and paper RPG set in the Diablo universe is known as Diablerie and includes a series of Dungeons and Dragons 3rd edition rulebooks and adventures.

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