Despite being called a 'lightning bug', they, in fact, have nothing to do with electricity. Or fire, for that matter.
Rarity: Common
Type: Active familiar
Obtained: Discovery Cove; Some Events and activities
Use: On a Spirit or on a Den
Stacks: Yes
Effect:
On a Spirit: Adds 1 luck to rolls, multiplied by the number of fireflies attached to the spirit. {Farmer 1-2 increases it by 1.5x, Farmer 3 increases it by double}
On a Den: +9 appeal in nighttime images
Custom Familiar Information: Must be a species of firefly. Back end should be able to glow, but doesn't have to be depicted always glowing.