Eleondor
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I usually use a team of 3 heroes: Markel, Arantir, and Ornella.
With Markel, I rush (I pick up undead creatures and immediately take the undead upgrade). With Arantir, I level up his knowledge and spellcasting skills, and then, after taking any castle or in a simple battle, I summon a dragon with arch-imbued damage and titanic health. Ornella is purely for defending the castle, and we admire her eyelashes)))))