And if we go into more detail:
Nature: elves, griffins, phoenixes/magical dragons (depending on the situation)
Life: spearmen, crusaders, angels
Chaos: medusas (always!), nightmares (lots of HP), Black Dragons (if there are enough resources)
Strength: harpies, cyclops, monsters
Order: mages/golems, djinns, titans/mechs
Death: ghosts, vampires, devils.
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