Special Senses (PSR Supplement)
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Many creatures have extraordinary senses beyond those of humans. Some of the more notable ones are below.
Tremorsense
A creature with tremorsense can pinpoint the location of other creatures and moving objects within a specific range, provided that the creature with tremorsense and anything it's detecting are both in contact with the same surface (such as the ground, a wall, or a ceiling) or the same liquid. Tremorsense can't detect creatures or objects in the air.
Importantly, tremorsense isn't sight. Tremoresense can pinpoint the location of a creature, but not what it looks like or what it's doing. Anything detected with tremorsense is still effectively Invisible unless it can be seen with other senses.
This sense is associated with burrowing monsters.
Mindsense
A creature with mindsense can pinpoint the location of any thinking creature within a specific range. A creature can't be detected if it's a construct, undead, or has a Knowledge score of 1 or less.
Like tremorsense, mindsense isn't sight. Any creature detected with mindsense is Invisible unless it can be seen with other senses.
This sense is associated with eldritch beings and powerful psychics.
Low-Light Vision
A creature with low-light version can perceive in dim light as if it was bright light.
Generally, this means the creature doesn't suffer the typical disadvantage on sight-based Perception checks in dim light.
Cats, elves, and other creatures with sharp sight often have this sense.
Darkvision
A creature with darkvision can perceive in darkness as if it was dim light, and in dim light as if it was bright light, but only out to a specified radius. When using darkvision you can't discern color, only shades of gray.
Blindsight
A creature with blindsight can perceive without sight, out to a specified radius. For the purpose of vision, a creature with blindsight treats all areas as unobscured bright light—even areas of magical darkness. A creature with blindsight can "see" even a magically Invisible creature, effectively negating the effect of this condition. Blindsight still cannot see around obstacles, and as such can't see a creature concealed by total cover.
Biosonar
Biosonar functions like blindsight, but it relies on a creature's hearing to function. A creature can't use its biosonar if it can't hear, or if has disadvantage on ability checks made to hear—such as in a strong wind.
Bats and some other creatures are Blind without biosonar, as specified in their respective stat blocks.
Truesight
A creature with truesight can—out to a specified range—see clearly in any light level, see all Invisible creatures and objects, see the true form of any Shapeshifted creature or object. In this range the creature notices any illusions and automatically succeeds on any save or check imposed by them. Truesight can see around and through obstacles, including creatures behind total cover.
This sense is strongly associated with celestials and deific figures.
