As promised, here is the first game idea for the Dagor Dagorath setting. This game would concern the ascension of Melkor, following his breaking of the Doors of Night, stealth intrusion into the Timeless Halls, and stealing of a part of the Secret Fire from Eru.
Now, I have already written in small part about this in the main setting, but obviously there is a lack of dialogue except for Melkor's short speech when he claims the Secret Fire. So this would have to follow main characters concerned, being Melkor, Sauron, Saruman, Fraule, Geldorin and Horinthe, in addition to Eru and some Ainur in the Timeless Halls, who would be original characters.
This game would consist of Melkor and his companions breaking the Doors of Night, and then swiftly and in stealth ascending to the Timeless Halls, where Melkor's companions would create a distraction(or several) to draw out Eru, who Melkor would then ambush Eru and steal part of the Secret Fire from him. Then, the scenario would finish with a battle between Melkor and Eru, and Melkor fleeing to start creation of his army of death.
So for this scenario, there is much discussion to be had before the game proper can begin. We have to fill a fairly significant number of players, and we have to determine several things. First off, how does Melkor manage to get into the Timeless Halls without Eru knowing? Now obviously, the entire Dagor Dagorath setting goes off the fact that Eru is actually not Omnipotent or Omniscient, because if he were then Melkor could never get the Secret Fire to begin with. Even assuming that Eru is not all-knowing however, there would doubtless be an incredibly strong guard upon the Timeless Halls, which Melkor would have to breach in stealth without alerting any of its guardians or Eru.
So that is a big question, and the other question is the breaking of the Doors of Night, how it is managed and indeed where they are located. DieWalküre and myself are divided on this, as I always interpreted them as being physically located somewhere inside Valinor, while DieWalküre considered them as ethereal, located somewhere in the sky or aether, basically like an entrance to Heaven. So that is a major question, and then the other is how the Doors are broken by Fraule, Geldorin and Horinth without raising any kind of alarm about their actions.
So, take it away with the discussion, hopefully we can resolve these 2 main points quickly and then get on to the game

Regarding the players, I will take the role of Eru for this one, which leads that what is needed are Evil characters and a couple of Ainur who save Eru from Melkor's overwhelming power.