I've been thinking on ways we could extend Muspel so that people who want to farm the monsters on the starting floor can have more time to hunt when the MVP'ers come and take down Surtur and Fafnir before any significant farming can be done.
The main idea that I came up with is to make Surtur into a Load bearing boss. After he's defeated, you have a set amount of time to make your escape back to Niflheim. During this time, all of the monsters inside attacks will intensify (more of them, perhaps with some buffing monsters introduced among them). Truely, nothing is more annoying than a boss that goes "if I go down, I'm taking you with me!"
Perhaps we can make it so that after that point where surtur is beaten, if you log out in muspel you lose money or exp, and Automatic ressurections no longer are in play. Perhaps you have to spend more of the Spark of Muspelheim to get out of the gate back to Niflheim as well.