- "It's the Pax."
- ―River Tam[src]
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 thousandth of a percent 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.