Bloatfly larva

The bloatfly larva is a type of ammunition in Fallout 4.

Characteristics
The bloatfly larva (syringe) is a small syringe similar in appearance to a tranquilizer dart. It is not actually considered ammunition, instead located under aid in the Pip-Boy, as a consumable. Accordingly, it is not weightless, though it does weigh very little.

Effects
By itself, the bloatfly larva syringe does little damage. However, when injected into an enemy, there is a 10% chance that a bloatfly will spawn from their corpse if they die within 30 seconds of the hit. This can be used to create a distraction, as the spawned bloatfly will be hostile towards everyone around them (the player character included). Spawned bloatflies can be any variant of bloatfly: black, festering, glowing, and even legendary versions of each. Thus, the bloatfly larva syringe can be a useful way to "farm" Legendary enemies for valuable loot without reloading saves.

Weapons using this ammunition

 * Syringer

Locations
It can be crafted at a chemistry station.