Toxic nerve agent in humanoids?

In my world, wood elves use magic charms and illusions to ensnare their prey. They have a very opportunistic diet as they eat anything that walks into their forest. After consumption they sleep for days and weeks to aid the digestion process and conserve energy. I'm trying to create a scientific gas that can be found in the elves mouth that doesn't affect them but destroys the nerves and reduces the pain for the victim when their limbs are bitten off. Would this chemical be secreted through fangs like venom or found in saliva? I would prefer for the ability to be a naturally biological function but if magic needs to be involved that's fine.

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Toxic nerve agent in humanoids?

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