Low Light Vision - caraminden/anathema-roguelike GitHub Wiki
Low Light Vision allows a character to see more easily in conditions of low Light levels. A character with some amount of Low Light Vision perceives enemies in Locations with less than 50% Light as though they have one higher level of Visibility.
A character with Low Light Vision would perceive a Concealed enemy in a Location with 20% Light as though it was only Partially Concealed.
A character with Low Light Vision would still perceive a Partially Concealed enemy in a Location with 60% Light as though it was Partially Concealed.