Sense Trait Tags: How Creatures Perceive

Sense Trait Tags are the rules, labels, and sensory descriptors that define how a creature perceives creatures, hazards, terrain, and hidden threats. In PF2e-style rules, senses are organized around three levels of acuity—precise, imprecise, and vague—and around the detection states they can establish, such as observed, hidden, and undetected.

A creature usually relies on vision as its default precise sense and hearing as a common imprecise sense, but special senses can change that dramatically. Darkvision, low-light vision, scent, emotion sense, echolocation-style abilities, life sense, thought sense, vibration sense, and similar abilities all alter what a creature can detect, how accurately it can detect it, and what conditions interfere with or bypass that perception.

For creature design, a custom sense is straightforward to build: decide what it detects, whether it has a range, and whether it is precise or imprecise. This makes Sense Trait Tags one of the most useful branches for Starfall, because the setting’s tech, cybernetics, Rift anomalies, drones, void conditions, and alien biologies all invite unusual sensory profiles.

The three acuity levels

Precise senses let a creature perceive the world in full, actionable detail and are the only way to truly observe a target without sensory penalties. Vision is the standard example.

Imprecise senses can locate a creature well enough to reduce it to hidden, but not to observed. Hearing and many special tracking senses function this way.

Vague senses only alert a creature that something is present, without clearly locating it. Smell is often treated this way unless a specific ability improves it.

This distinction is the heart of Sense Trait Tags. Most sensory abilities matter not because they merely exist, but because of the detection state they can establish under pressure.

Detection and stealth

Sense Trait Tags are inseparable from stealth play. A target can only be observed through a precise sense, whereas seeking with an imprecise sense generally leaves it hidden. That means sense profiles often matter more than Perception bonuses when determining whether a creature can actually pin down a sniper, stalker, drone, or phase-shifted anomaly.