An entity that cannot “see” suffers various circumstantial penalties, outlined below. Commonly, illumination, the Hidden property, and the Invisible condition convey these penalties. Note that for these rules, “seeing” does not require eyesight. Other equivalent senses that give full awareness also qualify and may bypass illumination and other properties entirely; see Sightless Vision.
Many Challenges ignore all vision-based penalties and rules.
If an entity is attacked by another entity it cannot see, the defender decreases the dice level of any Evasion Dice by 1.
In combat, an entity cannot play an Action without the Area Attack keyword against a target in a section it cannot see as a result of illumination unless the attacker is aware of the general presence of a particular target and suspects the target may be in a given section. In other words, blind attacks into the darkness “just in case something is there” always fail, even if the attack lacks a Hit entry. While this restriction does not apply to Area Attacks, the Hit penalty does still apply.
If an entity occupies multiple sections or regions with different illumination, only consider the location in which the attack originates or the Skill Dice are needed.