The land of Sanctuary has been consumed by an evil force of no known origin. A grand puzzle has been let loose and set before you: a mad king, his missing heir and a mysterious archbishop. As you journey to the town of Tristam, inhabited by only a handful of survivors, you soon find yourself facing hostile creatures macabre and horrid, far beyond your wildest nightmares.

In this dark and gothic fantasy world, Diablo pits you as a hero facing demons, monsters, and the undead that have risen, terrorizing the populace. Summon all your courage as you adventure deep into the dungeons and catacombs to find the source of evil plaguing the lands and put an end to it.