Gloom
Illumination
Also Dim Light
Part of Illumination
Gloom is dim IlluminationIllumination IlluminationIllumination is the light level that affects how you detect Targets using your Sense of Sight. with reduced visibility and shadows, such as twilight, moonlight, and weak diffused light.
Core Rule—Gloom
You’re ShroudedShrouded VisibilityShrouded is a Visibility state in which others can barely see you, such as in Gloom, or in areas of modest fog, foliage, rain, or mist. to CreaturesCreature TargetCreatures are animate Targets, distinct from inanimate Objects. you’re ObservedObserved DetectionObserved is a Detection state you’re in when a Creature detects you with a High Fidelity Sense. by.
Source Player Codex