Diablo (otherwise called Diablo I) is an action-adventure game developed by Blizzard North and released by Blizzard Entertainment on December 31, 1996. Set in the Kingdom of Khanduras (located in the Diablo series world of Sanctuary), Diablo has the player take control of a lone hero as he or she battles to rid the town of Tristram of the titular Lord of Terror and his horde of demon minions lurking in the shadows underground beneath the Church.