Noble physiology

“To be a Noble, most likely, is to live by night,” D began softly, with his
longsword in his right hand and a cup of steaming coffee in his left. “The
potential power inherent in the darkness of night and the shadowy influence
it has on the Nobility down at the very molecular level are mysteries today
—even during the Nobility’s golden age of science, they couldn’t begin to
unravel them. The question of why the flesh of the Nobility is invincible,
the secret of how they can live eternally, ageless and immortal so long as
they’re spared from sunlight or a blow from a stake, or the riddle of why
that blow has no effect whatsoever unless taken through the heart. It’s
nothing if not ironic that they, the first creatures in the history of the world
to reach a measure of longevity that could never be surpassed, were
anguished as no others by trying to discover the secret of their powers.”

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