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Chapter 9: Playing the Game / General Rules / Perception / Senses

Precise Senses

Source Core Rulebook pg. 464 3.0
Average vision is a precise sense—a sense that can be used to perceive the world in nuanced detail. The only way to target a creature without having drawbacks is to use a precise sense. You can usually detect a creature automatically with a precise sense unless that creature is hiding or obscured by the environment, in which case you can use the Seek basic action to better detect the creature.