I would infer from what I have mentioned that perhaps I may have some gift of this kind, not that of being invulnerable, because experience has many times proved to me that I am of tender flesh and not at all impenetrable; nor that of being proof against enchantment, for I have already seen myself thrust into a cage, in which all the world would not have been able to confine me except by force of enchantments.
Now it is an established fact that all or most famous knights-errant have some special gift, one that of being proof against enchantment, another that of being made of such invulnerable flesh that he cannot be wounded, as was the famous Roland, one of the twelve peers of France, of whom it is related that he could not be wounded except in the sole of his left foot, and that it must be with the point of a stout pin and not with any other sort of weapon whatever; and so, when Bernardo…
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When this world is sealed, I will not just be invulnerable; I will live forever.
Cassandra Clare -- City of Heavenly Fire
They walk in the dark, along the edges of high cliffs, humming to themselves, thinking themselves invulnerable.