Pyromancers stared directly into roaring fires until their retinas burned badly enough to see prophetic visions
In ancient times, if you wanted to talk to the fire gods, you just stared into the flames until things got weird. Staring at bright light physically damages your retinas, leaving floating afterimages and causing sensory deprivation. The 'demons' they saw were literally just their optic nerves screaming for mercy.

This article describes beliefs and cultural traditions, which are not necessarily scientifically established facts.
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