Frukathka said:
Use Khelben Arunsun to fill the void of the Eigth school. Also, you're going to need to work something up on who will take over the duties of ruling Aglarond after The Simbul becomes a protector of the Weave.
Elminster could be just the general oversser of the weave and divine consular on the behalf of magic for the gods after Midnight is gone. Also, I'm not sure if you know but one of the Seven Sisters is drow. Another thing to consider is Shars' exercion over the Shadow Weave.
I've been convinced by a friend of mine that the Seven Sisters idea isn't very good. So, this is my new plot:
Shar brings Karsus back to live and he is going to serve her. Karsus together with the Twelve Princes of Shade (including Telamont Tanthul, who is happy to see his master again) cast a spell/perform a ritual that causes Mystra to be imprisoned. This will take away the main defenses of Silverymoon, which will be attacked by the Red Wizards, who have been mastered in the Shadow Weave by Shar. Shar also aligns with Cyric and Talona.
Bane would either try to rally with the sharrans - after seperating cyric from them - or try to gain his best advantage, maybe even helping the white hats at first.
I'm unsure about what would happen to Larloch and Ioulaum if they see a realistical chance of Netheril being refounded... It might be an interesting twist if one or both of them play the good guys for a change. And since both of them know Karsus and Telamont pretty well, their experience would be invaluable.
The other white hats would of course try to foil the ritual, maybe try to break the alliances between the hostile factions.
(Remember this campaign will start at 1st level, so these things can happen very slow.)
As for the Nether Scrolls: A complete set rests in Windsong Tower, Myth Drannor. The other set is still lost. Some claim they circle the realms in the form of ancient platinum coins. A 'noble' (he is actually a sharran shadow adept) asks them to collect nine magical platinum pieces (doesn't tell PC's why, or he lies about their nature), and after collecting the coins and teleporting them to Shade, he tries to destroy the PC's so nobody knows a thing. This will be the start of the campaign...the PC's collecting the pieces.
Ideas/suggestions?