The story is centered on the Kingdom of Khanduras and the small town of , which has fallen into darkness after the awakening of the demon Diablo.

: The King went mad with grief, and the cathedral became a source of inhuman screams and demonic infestations, leading many villagers to flee while others were lured into traps, such as the lair of the infamous Butcher .

Diablo's enduring legacy is built on several technical and design "firsts" that became staples of the ARPG genre. The Tragic Story of Diablo 1 - Diablo Lore Explained

: Players choose one of three heroes to enter the cathedral and end the terror: Warrior : A master of close-quarters melee combat. Rogue : An expert archer with a keen eye for traps. Sorcerer : A powerful wielder of magic and spells. Foundational Gameplay Innovations