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And if such a situation arises - the enemy creates a phantom (or several, but not far from each other), then the banshees calmly approach, use their scream, eliminate the phantoms, and also deal damage to regular creatures. But what would you do if, instead of banshees, you had Death Knights...?
As for the vampires, the alternate upgrade is complete garbage; they nerfed it. Maybe the alternate vampire upgrade looks good, but beauty requires sacrifices.