Obsidian's Neverwinter Nights 2 has been considered a commercial success by a lot of people. It has also spawned an expansion called Mask of the Betrayer. This expansion offers quite a lot of features that were sorely missed by the more hard-core players of the game such as epic levels.

Initially, there was talk about having death be more permanent than it was in NWN2, but there were concerns about what would have to change in gameplay and in the engine and whether that was worth it. So, the focus moved to how to make death still matter to the player.

This turned into an entirely new mechanic that makes time much more critical to the player. Certain areas change as day goes to night and while you can rest in most places, there are going to be other things to consider as you use up that time.