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In the global view, the game should be about rushing, especially on large maps, because you can't give the Necromancer time to systematically eliminate neutral creatures. Moreover, once he has gathered enough skeletons, he will sweep through the utopias and won't even be slowed down – then it becomes almost impossible to kill him. As for the specific battle, the focus is on tactical skill and having ranged units to eliminate the skeletons. Therefore, various slowing effects, static shields, and quicksand are welcome. Ideally, you defend with a tower that has 3 ranged units and strong magic. Regarding liches: they are simply blocked either by gargoyles or djinn, even at the expense of the latter, and in one round, all ranged units eliminate them. After that, the crowd of archers and their protection can only be countered by a meteor shower. The same barbarian can also play a great defensive game. In principle, the problem with liches can be solved with a single Implosion spell, and then the entire tactic is built around defense. In rare cases, for example, if the barbarian has the Tactics skill and Expert Speed, he can eliminate the skeletons in one round, as having an advantage in combat stats, the barbarian can easily handle the rest of the army