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. 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, a bloatfly will sometimes spawn from their corpse after death. This can be used to create a distraction, as the spawned bloatfly will be hostile towards everyone around them (the player 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

 * Crafted by the Sole Survivor