Magnesium Bioluminescence: The firefly sheds bright light in a 10-foot radius and dim light for an additional 15 feet.
Evasion: If the firefly is subjected to an effect that allows it to make a Dexterity saving throw to take only half damage, it instead takes no damage if it succeeds on the saving throw, and only half damage if it fails.
Description
A long time ago, high above an enchanted forest, a meteorite rich in magnesium tore through the sky, burning away and raining down magnesium dust. Fireflies throughout the area absorbed the magnesium dust along with the forest's natural arcana, causing their glow to take on a light blue hue. Due to absorbing arcana, the fireflies began to glow even brighter. This, however, was not a blessing, because their brighter glow almost caused their species to die out, as they could be easily spotted by predators. All the inhabitants of the forest who saw the blue cosmic meteor burning up and giving fireflies their new glow decided to give them a new name. Cosmic Fireflies. The inhabitants, seeing the new species dying out, began to collect them, protecting them from extinction. Because of the fireflies' brighter glow and ability to feed off the background arcana, they were used in lanterns. Adventurers began carrying these lanterns across the world, spreading throughout the world and settling in other enchanted forests. Cosmic fireflies cannot survive without a source of arcana to feed off of, so any adventurers who took the fireflies would need to have some kind of connection to the arcane, so the fireflies could feed off it, or else the fireflies would die.
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