- "It's the Pax."
- ―River Tam
G-23 Paxilon Hydrochlorate or "Pax" (Latin for "Peace") was a chemical compound added to the air processors in order to pacify the populace, by the Union of Allied Planets. An Alliance research team on Miranda discovered that the Pax was effective with 99.9% of people. It was such an effective means of pacifying that the people stopped doing anything, they simply waited for death. However, a tenth of a percent (0.1%) of the population had the opposite reaction. They became highly aggressive, committing unspeakable acts including cannibalism, rape, and self-mutilation. These people would come to be known as Reavers.
Paxilon is also the drug referenced in the "Train Job" episode of Firefly... could it be that Mal assisted in inadvertently turning everyone in Paradiso into Reavers, for a plot in a later season? And Niska is actually a good guy who is on to the Alliance's social engineering practices and trying in his own way to foil it?
- The Pax is a reference to the Pylene-50 used in the Pacification Programme in "Blake's 7".