[[Image:Diablo_Archive_cover.jpg|thumb|Diablo, Lord of Terror]]'''Diablo''', the ''The Lord of Terror'', is the primary antagonist in the ''Diablo'' video game series developed by [[Blizzard|Blizzard Entertainment]]. He is the final boss in the first ''Diablo'' game, and the final boss in ''Diablo II'' prior to the release of the expansion pack. Along with his older brothers, [[Baal]] and [[Mephisto]], Diablo is one of the three [[Prime Evils]].

[[Image:Diablo_1_portrait.jpg|left|100px100pxthumb|100px]]The first encounter with Diablo occurs after a lone hero journeys deep beneath [[Tristram|Tristram's]] Cathedral in search of a demonic presence plagueing the countryside. Diablo had nearly possessed the former ruler of Khanduras, [[King Leoric]]. Finding the king too strong willed to dominate completely, Diablo instead possessed his son, [[Prince Albrecht]]. The hero takes a portal directly to Hell in order to confront Diablo directly, ultimately defeating him. The misguided hero drove Diablo's soulstone into his own forehead, hoping to contain the demon himself.

[[Image:Diablo_2_portrait.jpg|rightthumb|200px200px200px]]The opening cinematic of ''Diablo II'' introduces us to the [[The Wanderer|Wanderer]], the warrior who defeated Diablo underneath Tristram and is now pursued by a group of heroes. The Wanderer travels the countryside, unleashing demons and horrors in his wake as he is slowly possessed by Diablo. Surrendering control to the demon within, the Wanderer frees [[Baal]] and [[Mephisto]], eventually traveling to Hell where he completes the transformation into his true demonic form. He is once again followed to Hell, where the pursuing heroes unlock five seals to summon him in his Chaos Sanctuary. After defeating Diablo the heroes destroy his soulstone, banishing him from Sanctuary back to the Burning Hells.

[[Image:Diablo_3_portrait.jpg|left|240px240pxthumb|240px]]Aside from a brief appearance in the cinematic trailer, not much is known about Diablo's role in the upcoming sequel.