Fallout ( Unofficial Revised Ed.)
When the bombs hit, some people were irrevocably changed (and not just the ones who were atomized at ground zero, either). Ghouls are humans who were alive when the bomb went off, and the radiation altered them at a cellular level. Ghouls enjoy an extremely slow cellular mitosis rate, rendering them essentially immune to the effects of old age. The radiation also changed their outward appearance, forever marking them as outsiders. Their skin hangs off their bones, sometimes in shreds, and sunken eyes peer out from skulls twisted and burned by radiation, giving these unfortunate people their name. Their skin can be anywhere from pale white to dirt brown in color, with green and yellow the most common. When they do have hair remaining, it usually does not grow. Some ghouls were inexplicably merged with plant species, and have shrubs and moss growing out of various parts of their bodies. It might have twisted their bodies, but the radiation did not affect their minds, and they are forced to live as misshapen outcasts, fully aware of the society they were once part of, but also aware they can never rejoin it. For this reason, many ghouls have formed settlements of their own, or live in settlements with humans and mutants who do not mind their appearance. Unlike their mythic namesakes, ghouls do not eat human flesh. They do, however, require a small amount of radiation to survive, and for this reason, one can often find a population of ghouls around a leaky nuclear reactor or an impact crater from the war.