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No one is going to attack a large army consisting only of Hydras, just as they wouldn't attack any other Tier 5 unit. I think that if you think about it carefully, you can understand what I'm talking about. Hydras with 125 hit points still take longer to kill than, say, Liches with 55 or even Inquisitors with 80, and this difference is noticeable... And a Warlock can take advantage of this, both in the final battle and in other engagements.