Firefly

A  is one of the airborne monster types you'll encounter. It has an energy shot projectile that it can fire once per attack at a fair distance. It is rather easy to dodge the energy shot, but can become tense when there are swarms of them firing at you from all different directions. Rotating Turrets are particularly effective against fireflies.

Location
You can most commonly find fireflies flying above or near the surface or just below the surface, in the central portion of the world in the Grassy Hills biome.