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Haggish, in addition to increasing attack and defense, also speeds up the first turn of the centaurs, which can be extremely useful, as centaurs can significantly damage any ranged unit of the enemy by moving before it, even with lower initiative. And the initial upgrade, in my opinion, is one of the best for the Stronghold. Attack, which I think is always worth upgrading, and Memory of Blood, which reduces losses in battles with neutral creatures.