Fire is often believed to be a purifying force, but the dark flames that you can conjure do not burn away impurities. They instead consume their victims with sickly shadows that rot away vitality and vigor, leaving only desiccated corpses, withered wood, and corroded metal. Where natural flame eats away all that it touches in radiant light, shadowflame eats the very light it once would have produced.
Before casting a spell that deals fire damage, you can spend a bonus action to alter the nature of the spell. Once altered, that spell will deal necrotic damage instead of fire damage and be unable to set targets on fire. Any light that would be generated by the flames is instead reversed. As such, a fire spell that creates bright light for 10 feet and dim light for another 10 feet would instead create darkness for 10 feet and reduce bright light to dim light for another 10 feet.
You may also perform this bonus action before casting a spell that deals necrotic damage to instead have that spell deal fire damage. This does not allow the spell to set targets on fire.
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