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It's tough, sometimes almost impossible, but there are usually still chances...
Life - level up the Paladin, gather ballistas, and learn defensive magic, starting with death wards.
Death - accumulate more vampires than the enemy necromancer! And don't hire imps, cerberuses, or devils.
Order - on large maps, it's not weaker than Death, so the main thing here is mages (hero characters). Slow down the vampires, and when they get close, teleport them further away. While this is happening, genies, other heroes, and the rest eliminate the support units, and then everyone together kills the bloodsuckers. Just make sure you have enough mana... And golems are definitely essential.
Might - probably only a rush strategy. A well-leveled barbarian is powerful, but he can't handle hordes of vampires; it's not even black dragons.
Chaos - disintegration spells, and vampire attacks with ifrits.
Nature - theoretically, water elementals (and maybe dragonlings), and units from the portal and summoned units. Mantises or phoenixes, supported by a dragon, can hold them off for quite a while, giving you time to summon as many elementals as possible. But even then, it's not certain that it will save you
Life - level up the Paladin, gather ballistas, and learn defensive magic, starting with death wards.
Death - accumulate more vampires than the enemy necromancer! And don't hire imps, cerberuses, or devils.
Order - on large maps, it's not weaker than Death, so the main thing here is mages (hero characters). Slow down the vampires, and when they get close, teleport them further away. While this is happening, genies, other heroes, and the rest eliminate the support units, and then everyone together kills the bloodsuckers. Just make sure you have enough mana... And golems are definitely essential.
Might - probably only a rush strategy. A well-leveled barbarian is powerful, but he can't handle hordes of vampires; it's not even black dragons.
Chaos - disintegration spells, and vampire attacks with ifrits.
Nature - theoretically, water elementals (and maybe dragonlings), and units from the portal and summoned units. Mantises or phoenixes, supported by a dragon, can hold them off for quite a while, giving you time to summon as many elementals as possible. But even then, it's not certain that it will save you