Mike Mearls: Where the Shadowfell is a realm of, essentially, depression. It's where everything just goes to just stop. You know, the challenge in the Shadowfell is how do you fight through that, it's dolorous nature, right. You might go to the Shadowfell, and then lose track of your quest. You might fall victim to it. You might start, yourself, just repeating the same thing. Like, let's say you're traveling across the Shadowfell, you might just start traveling in circles, endlessly, you lose all hope. You lose all emotion. What drove you here is probably something emotional, your goal. And instead you just accept stasis and just become part of the scenery, essentially. So that's how those two realms are positioned.