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1. Magic might be available for each element (dragon), i.e., eight.
2. Necromancy will probably be changed again, and if I understand correctly, its new application is something I like. It's quite logical.
Regarding the Spectres, I didn't quite get it, but maybe they can be summoned during battle, like the Djinns?
3. Necropolis doesn't have a capital; it seems the campaign for them will take place right under the noses of the Mages, and therefore they will fight against them.
Added 3 minutes later
Demons are fast and strong, so what's left for the Orcs?