Special Senses

While a human might have a difficult time making creatures out in dim light, an elf can see those creatures just fine. And though elves have no problem seeing on a moonlit night, their vision cannot penetrate complete darkness, whereas a dwarf’s can.

Special senses grant greater awareness that allows a creature with these senses to either ignore or reduce the effects of the undetected, hidden, or concealed conditions (described in Detecting Creatures below) when it comes to situations that foil average vision. The following are a few examples of common special senses.

Darkvision and Greater Darkvision

A creature with darkvision or greater darkvision can see perfectly well in areas of darkness and dim light, though such vision is in black and white only. Some forms of magical darkness, such as a 4th-level darkness spell, block normal darkvision. A creature with greater darkvision, however, can see through even these forms of magical darkness.

Low-Light Vision

A creature with low-light vision can see in dim light as though it were bright light, so it ignores the concealed condition due to dim light.

Scent

Scent involves sensing creatures or objects by smell, and is usually a vague sense. The range is listed in the ability, and it functions only if the creature or object being detected emits an aroma (for instance, incorporeal creatures usually do not exude an aroma).

If a monster uses a sense other than vision, the GM can adapt the variables that keep its foes from being detected to equivalents that work with the monster’s senses. For example, a creature that has echolocation might use hearing as a primary sense. This could mean its quarry is concealed in a noisy chamber, hidden in a great enough din, or even invisible in the area of a silence spell.

Using Stealth with Other Senses

The Stealth skill is designed to use Hide for avoiding visual detection and Avoid Notice and Sneak to avoid being both seen and heard. For many special senses, a player can describe how they’re avoiding detection by that special sense and use the most applicable Stealth action. For instance, a creature stepping lightly to avoid being detected via tremorsense would be using Sneak. In some cases, rolling a Dexterity-based Stealth skill check to Sneak doesn’t make the most sense. For example, when facing a creature that can detect heartbeats, a PC trying to avoid being detected might meditate to slow their heart rate, using Wisdom instead of Dexterity as the ability modifier for the Stealth check. When a creature that can detect you has multiple senses, such as if it could also hear or see, the PC would use the lowest applicable ability modifier for the check.

If a creature emits a heavy aroma or is upwind, the GM can double or even triple the range of scent abilities used to detect that creature, and the GM can reduce the range if a creature is downwind.

Tremorsense

Tremorsense allows a creature to feel the vibrations through a solid surface caused by movement. It is usually an imprecise sense with a limited range (listed in the ability). Tremorsense functions only if the detecting creature is on the same surface as the subject, and only if the subject is moving along (or burrowing through) the surface.