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I tried playing against myself, pitting a Necromancer against a Knight – it’s tough, of course. There’s a dangerous synergy between strength and magic called “Dark Elemental.” If you boost strength against magic before the Necromancer gets a turn, he can summon a Dark Elemental, dispel Panthers or Centaurs, and eliminate them in one turn, rendering all his spells useless. After that, there’s very little chance of winning. So, it’s best to wait until the Necromancer casts his spells and then use strength against magic on your first turn. If you do it on the second turn, it’s usually too late: without the stack of Panthers or Centaurs, it will be difficult. On the second turn, you can try to protect the Weavers, or at least the Liches.