Strong Stomach

 
Prerequisite(s): Con 13+, Endurance
 
Benefit: You reduce the effects of sickening and nausea by one step. You cannot become nauseated. If you are exposed to an effect or condition that would normally make you nauseated, you become sickened instead. If the effect or condition would make you sickened, you suffer no effect.
 
Source: Cityscape