Diablo II is an action role-playing hack and slash video game developed by Blizzard North and published by Blizzard Entertainment in 2000 for Microsoft Windows, Classic Mac OS, and Mac OS X. The game, with its dark fanta…Diablo II is an action role-playing hack and slash video game developed by Blizzard North and published by Blizzard Entertainment in 2000 for Microsoft Windows, Classic Mac OS, and Mac OS X. The game, with its dark fantasy and horror themes, was conceptualized and designed by David Brevik and Erich Schaefer, who with Max Schaefer acted as project leads on the game.