Ichor
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In Greek mythology, ichor (Greek ἰχώρ) was a mineral present in the blood of the gods that kept them immortal. It was sometimes said to have been present in ambrosia or nectar. When a god was injured and bled, the ichor made their blood poisonous to mortals.
In the TV show Hercules: The Legendary Journeys (though not in Greek mythology), it is neutralised by the blood of the Golden Hind, thus rendering the god mortal.