Light - caraminden/anathema-roguelike GitHub Wiki

Each Location in the game has an amount of Light that is cast on it by Light Sources nearby. More brighter Light Sources closer to a Location will cause it to have a higher Light level, while a lack of such Light Sources will cause the Location to have a lower Light level. In addition to the affect of Light Sources, the baseline Light level of all of Umbra is influenced by the current power level of the Sunstone.

The Light level of a Location can have a value between 0% (no light) and 100% (fully lit) and affects the Visibility of characters at that Location.