Diablo is an action-role playing dark fantasy series, deriving its namesake from its chief antagonist. Set primarily on the world of Sanctuary, it is based around an eternal conflict between the angels of the High Heavens, and the demons of the Burning Hells, with mankind caught in the middle. The concept for Diablo originated with Condor, which was purchased by Blizzard Entertainment and renamed as "Blizzard North." With the closing of Blizzard North in 2005 however, Blizzard (South) has taken over development of the series.