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GM Core / Chapter 2: Building Games / Building Creatures / Perception

Senses

Source GM Core pg. 115 2.0
Choose or design any special senses for your creature, such as low-light vision, darkvision, or scent. If you’re making a sense from scratch, simply decide what it senses, whether it has a range limit, and whether it’s precise or imprecise. For example, a sinspawn has “sin scent (imprecise) 30 feet.” This means it can smell creatures bearing its associated sin if they’re within 30 feet, and the sense is imprecise—about as acute as human hearing.