Diablo III will sport a custom 3D-graphics engine to "render lush indoor and outdoor areas of Sanctuary with a high level of detail and vivid special effects. The game's physics-enhanced environments will be interactive and destructible, offering traps and obstacles that create added danger for players and monsters alike." The game will also offer a new quest system and random scripted events, a random-level generator, and co-op and competitive play online via Battle.net, which is being upgraded. The storyline in Diablo III will pick up 20 years after Diablo II.