Firefly emits an unknown type of energy, which considerably speeds up healing in living beings, sometimes bringing people back from the dead in seconds. Emits radiation. - In-game description
The Firefly provides a heavy +6 in health regeneration, although it is a +3 in radiation, requiring a Wrenched or better to counter the effect. It is very useful to help players recover health quickly and good for sale due to being an expensive artifact.
The Firefly artifact can be found in very powerful chemical anomalies. It is most commonly found in the anomalous swamp in the Army Warehouses, but one can also be found in the underground area underneath the abandoned mining tunnel in the Red Forest.
Firefly interacts with fields unknown to science, considerably speeding up regeneration of tissue and organs in living beings, as well as normalizing metabolic processes. This artifact can literally get a badly wounded stalker back on his feet in seconds. Unfortunately, Firefly is extremely rare. Emits radiation. - In-game description
The Firefly returns in Call of Pripyat, having the same characteristics as in Clear Sky. It is part of Beard's artifact orders.