Neuron Fly

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SPOILER WARNING: 5P
This section contains major plot details from the "5P" region and beyond. If you have not progressed past this region, then read no further!

"Neuron Fly"

Information
Code name	OracleSwarmer
Category	In Looks to the Moon: Edible In Five Pebbles: Edible, Swallowable
Food Pips	1 As MonkAs Survivor 0.25 As Hunter 1 As GourmandAs RivuletAs Saint 0.5 As Spearmaster 0.25 As Artificer
Locations (amount)	Shoreline Five Pebbles Metropolis The Rot Looks to the Moon
Respawn time	None (respawning not determined by time)

Neuron Flies look like two thin tails connected to an oblong floating body with a white eye (or face) and shift colors randomly through red, white, blue, or purple, except for the unique green Neuron Fly Hunter starts with. They are prevalent in Five Pebbles and Looks to the Moon and a small number can be found in Shoreline floating over Looks to the Moon's puppet.

Function

Utility

Neuron Flies provide 1 food pip (1/4 of a pip as Hunter and Artificer) when consumed, and grant Slugcat the ability to generate their own light for the rest of the campaign when consumed for the first time on a save file. This is one of the only ways for the player to improve visibility in Shaded Citadel and is the easiest to use. They can also be stored in Slugcat's stomach when all of their food pips are filled.

While the Neuron Flies in Looks to the Moon do not respawn, the ones in Five Pebbles and Looks to the Moon do as soon as the room is unloaded by going far enough away.

After eating a Neuron Fly, Void Spawn appear near Slugcat in certain locations. They are trapped in little 'eggs', and upon touch, they break free and slowly travel in a direction that leads from Looks to the Moon to Memory Crypts, guiding the Slugcat in the direction of Five Pebbles instead of the Yellow Overseer.

Looks to the Moon's Neuron Flies

When Looks to the Moon is found, five Neuron Flies are flying above her. Catching these Neuron Flies causes Looks to the Moon to shake her head frantically and try to talk to Slugcat. With the Mark of Communication, she urges Slugcat to let them go. Eating them makes her throw herself to the ground and jerk around. Eating at least one or hibernating with it earns the Stolen Enlightenment Achievement. Eating all of them kills Looks to the Moon. If Slugcat hibernates without eating or taking one of her Neuron Flies the cycle they find her, the A New Friend achievement is earned.

From then on, as long as the player hasn't eaten any Neuron Flies, the yellow Overseer guides Slugcat to more Neuron Flies for Looks to the Moon. Following the Overseer takes Slugcat to Five Pebbles, in hopes that Slugcat delivers some to Looks to the Moon. If Slugcat has already eaten a Neuron Fly from Looks to the Moon, they can still find their way to Five Pebbles by following the aforementioned Void Spawn.

Looks to the Moon has the ability to read Pearls found in the world with any number of Neuron Flies above 0.

Neuron Flies changing colors
Looks to the Moon, accepting a Neuron Fly from the Slugcat
Slugcat becoming illuminated after eating a Neuron Fly
Looks to the Moon, pleading Slugcat to let go of her Neuron Fly

SPOILER WARNING: Hunter
This section contains major plot details from Hunter. If you have not made significant progress or completed the game as Hunter, then read no further!

Hunter's Neuron Fly

Hunter starts the game carrying a unique green Neuron Fly. This Neuron Fly can be stored in Slugcat's stomach to leave both hands free. If it lies on the ground for a few seconds, it starts hovering above the ground at the level of Slugcat's head and occasionally emits a complex hologram from its form.

When the green Neuron Fly is brought to Looks to the Moon, who is initially exhaustively incapacitated when Slugcat meets her, the green Neuron Fly reactivates her own Neuron Flies and brings her back to life. This is because the Neuron Fly holds 'slag keys'. Looks to the Moon became incapacitated because Five Pebbles deprived her of water, causing slag buildup which caused her processes to seize. The slag keys likely reactivated her water systems to flush out the slag and allowed her to become active again.

Spoilers end here.

Trivia

Neuron Flies cease movement and lose the ability to fly while outside of Five Pebbles or Looks to the Moon. This fact makes carrying Neuron Flies between the two Iterators much easier.
The only practical reason to deliver Neuron Flies to Looks to the Moon as Survivor or Monk is to receive bits of lore when she formats them, or to replace the Neuron Flies Slugcat ate.
Looks to the Moon still accepts partially eaten Neuron Flies.
Neuron Flies do not have a Sandbox item, similar to Noodlefly Eggs.
When playing as Gourmand, Looks to the Moon will consider crafted Neuron Flies that are given to her to be formerly Five Pebbles's.