d3是随机地图，这点和d1/d2一致的
官网faq里提到了

Also, Diablo III builds on the random environments of the previous Diablo games by introducing a host of new ways to create random scripted events throughout the game. This creates a dense and exciting world alive with quests, NPCs, dynamic encounters, and viciously challenging new monsters and bosses. Diablo III's environments add a great deal of interactivity to the game, including destructible elements and environmental obstacles that can be turned against your enemies.