We're proud of the original Diablo's dark, moody atmosphere and engaging item-grabbing gameplay. Diablo II added more environmental and monster variety, more diverse classes, and a number of unique elements that have since become synonymous with the franchise (like gems, runes, set items, etc.). Both games established the series' hallmarks: randomized levels, the relentless onslaught of monsters and events in a perpetually fresh world, unique quests, tons of items, and an epic story about the High Heavens, the Burning Hells, and the hapless and heroic human beings caught between them. Diablo III is the inheritor of this legacy, and we've added even more elements to the game to keep building on our vision for the world of Sanctuary.
In Diablo III, runes give you unprecedented control over your skills and powers, changing elemental damage types, accuracy, and area of effect; adding new debilitating effects like slows and stuns; and even altering the nature and appearance of your abilities.
The world of Sanctuary is never the same twice. That’s because parts of Diablo III's environments (excepting towns, cities and some landmarks) are randomized. Like puzzle pieces, they fit together to form mazes and dungeons that can be different each time you play through the game. Every time you start up a new game or load an existing character, the world changes. You'll find unfamiliar foes and unopened treasure chests in new places. What’s more, the physical layout of areas can shift; locations of caves and ruins can move around, and the well-trod path you took earlier might be covered with monsters. Even quest objectives can move around!