I don't see many/any champs that will help you in necro. The closest would be Odin, but he's only going to help with a few fights, followed by storm. Also, with your unit anunt, I don't think you should worry about necro anytime soon unless you're going to buy units.
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Also, with your unit anunt, I don't think you should worry about necro anytime soon unless you're going to buy units.
If you don't have Aegon, Shuri, or Kate, I would hold off on Necropolis
For General I'd do Scorpion