Demigod originated in ancient stories to describe heroes with divine heritage. In Greek mythology, Achilles was a demigod known for his strength and battle skills.
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Half Divine
Always implies a mix of divine and human qualities, not just superhuman abilities. Diana felt like a demigod with her newfound ability to heal others.
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Literal vs. Metaphorical
Used literally in mythology, but can be metaphorical in modern fiction or speech. The protagonist in the novel was a demigod, destined to save their dystopian world.