I just started having these really interesting ideas about a relatively short adventure in Angmar, and I thought I'd share them, to get comments and help and everything.
For one thing, Angmar seems to be an extremely open place to play in; there's almost no canon about it that you'd have to break! But it also gives some hints as to what might be there.
The basic premise of the chronicle would be this: when Gandalf, Bilbo, and the Dwarves visit Elrond, the Wizard steps aside with the Elf and they speak of rumors of a new evil rising in Angmar; possibly one of the Nine, even the Witch-king himself. These rumors were brought in by Arestel (my creation: younger brother of Arathorn II). They decide that Arestel must go into the North with a chosen few and, after seeking aid from the Lossoth, drive the new Evil from Carn Dûm.
Arestel once was married and had a young child; but one day when he was away hunting during a famine, his wife and child were slain by hunger-driven wolves. Crushed by his loss, he now lives alone, and feels their deaths were a result of his misuse of responsibility. When his brother Arathorn was slain, he was rightly grieved; but felt that he could not help raise his brother's 2-year old Aragorn, thinking he wasn't capable enough.
The Ring of Barahir, according to Appendix A, was given to the Lossoth by Arvedui Last-king as a token of their good-will; it has been sent South to Arestel, an unspoken request for aid. Arestel has brought this news to Rivendell, and is there at the same time as the Dwarves.
Thus, Arestel, along with a couple Rangers and/or Elves, goes into the North, and unites the Lossoth against Angmar. This would not only present lots of epic combat (a great battle between the Lossoth and the hordes of Carn Dûm for one) but also great roleplaying opportunities, as Arestel attempts to bring together the Lossoth (of course there will be disenters and traitors to deal with which will make it really interesting).
So what do you think of this mini-campaign? It could turn quite long, but I think I want to keep it at a manageable length, say, several sessions. Thanks!