Wealth was an inferior object, but what glory would attend the discovery if I could banish disease from the human frame and render man invulnerable to any but a violent death!
"I gazed on my victim, and my heart swelled with exultation and hellish triumph; clapping my hands, I exclaimed, ’I too can create desolation; my enemy is not invulnerable; this death will carry despair to him, and a thousand other miseries shall torment and destroy him.’
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Show samples from other sources
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.