Aegis
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Bobchik, why give an army to a secondary hero at all? The entire experience of playing Heroes VI teaches that this shouldn't be done :) Everything should be gathered into one powerful force!
With large armies, by the way, the hero with high Blood skill works great with "Drain" and "Mass Drain," and if you also put Arachne on the hero (upgrading this artifact to the fourth level), it's not life, but a real pleasure.