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Nope. The unupgraded ones are completely different. They have a spear, a green lizard, and an open elven face. And the upgraded ones have armor on the lizards, a headband on the elven face, and a cool spear-sword.
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Perhaps the only unattractive units among the Dark faction are the NOBODY units! The Dark Elf units are the most beautiful in the game! Only the hero is a bit underwhelming, but we're talking about units.