I can't imagine what a Necromancer can do against a Conflux.... Because everything is useless, except for the Black Knights, who will be killed anyway, and besides, a lot of money is needed to ransom troops, which is difficult for a Necromancer... And he will always be behind in development + there is no 7th level in principle.
A Tower can be destroyed, if you find 7 resources in the first week, or at the latest in the second week + a well-developed guild of mages. And by the way, it's also fun to destroy everyone with Gremlins