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Yeah. As was already mentioned, in Wake of Gods Necromancers remain a very strong faction even without the Necromancy skill. So what if an extra 500 skeletons got randomly rolled to an FB - it happens to everyone :D
The main imba of Necromancers is the free skeletons. Dragon Fly Hives, refugee camps, utopias - they need to be taken. Skeletons, on the other hand, appear out of thin air.