dnd 5e – Blindsight and Tremorsense for a Blind PC?

Mechanically, within the radius of their blindsense, a blind character functions as a character with normal vision, with the benefit that nothing can obscure their vision.

Within that radius, this makes them stronger than creatures with darkvision standing in darkness. They are immune to the effects of spells like fog cloud and darkness (and of course, spells that cause blindness), and their opponents gain no benefit from effects that render themselves invisible.

Outside that radius, everything is heavily obscured and opponents have the benefit that they don’t need to use those spells or effects (conserving resources). The character has disadvantage on attack rolls against opponents at this range, while these opponents have advantage on attack rolls against the character.

By focusing on melee combat (unarmed strikes) the monk is able to take advantage of some of the above benefits simply by staying close to the enemy. Even deflect missiles, since it doesn’t depend on sight1, works as normal, mitigating some of their weakness against ranged attacks. In addition, the Way of Shadow monk will be able to cast darkness without hindering their own “sight”. Even the Way of the Four Elements monk is not significantly limited, as very few of their “spells” rely on sight.

All in all blindsight is a decent way to wave off the mechanical disadvantages of blindness, and a clever player can even take advantage of some of the above benefits. I would advise against including tremorsense though. If you look carefully you’ll see that is specific to burrowing monsters. Blindsight alone, even limited to 15 ft., is sufficient for this build.


1. As @SeriousBri points out, features that require sight will say “that you can see”; compare the Hunter Ranger’s uncanny dodge.

Can a creature with Blindsight see a Scrying Sensor? Is that sensor an object? Can it be destroyed?

Scrying:

A creature that can see Invisible Objects sees the sensor as a luminous orb about the size of your fist.

Blind Sight:

A creature with blindsight can perceive its surroundings without relying on sight, within a specific radius. Creatures without eyes, such as oozes, and creatures with echolocation or heightened senses, such as bats and true dragons, have this sense.

dnd 5e – Does the Arcane Archer’s Shadow Arrow inhibit blindsight, tremorsense, and/or truesight?

Shadow Arrow:

You weave illusion magic into your arrow, causing it to occlude your foe’s vision with shadows. The creature hit by the arrow takes an extra 2d6 psychic damage, and it must succeed on a Wisdom saving throw or be unable to see anything farther than 5 feet away until the start of your next turn.

Blindsight:

A creature with blindsight can perceive its surroundings without relying on sight, within a specific radius.

If a creature with blindsight (like a Flying Sword) fails its saving throw against an arcane archer’s Shadow Arrow, is its ability to perceive enemies via blindsight restricted? Would creatures with truesight or tremorsense be handled the same way?

It seems to me that this is fairly straightforward, but upon reading this question about opportunity attacks, there seem to be cases where the word “see” is used more generically as all forms of perception.

dnd 5e – Does a creature possessed by intellect devourer have blindsight?

The intellect devourer’s feature Body Thief says the following:

While inside a creature, the intellect devourer has total cover against attacks and other effects originating outside its host. The intellect devourer retains its Intelligence, Wisdom, and Charisma scores, as well as its understanding of Deep Speech, its telepathy, and its traits. It otherwise adopts the target’s statistics.

Does it retain its 60ft blindsight and immunity to the blinded condition while inside the creature?

dnd 5e – Do crabs have blindsight out of water?

A wizard can choose a crab as a familiar, and crabs have a blindsight of 30ft and are amphibian.

I can understand why crabs would have blindsight in water, as they can notice movement in the water and (apparently) changing salt levels to detect enemies. But it makes no sense for a normal crab to have blindsight out of water.

But from a purely mechanical standpoint, nothing is stopping me from having a crab familiar, and get 30ft blindsight by sharing senses with my familiar. Essentially having a constant “detect invisibility” seems a bit strong though for a 1st lvl spell.

Thoughts?

dnd 5e – Does Blindsight recognize a search sensor?

The description of the spell simply says that the sensor is invisible.
Invisible objects still have mass, physical dimensions, and the like. If other properties were used, terms such as "immaterial", "ethereal", etc. would have been used. So it is simply invisible according to rules as written.

The sensor is only described as:

A creature that can see invisible objects sees the sensor as a glowing ball the size of your fist.

According to this description, there is no sound or smell or other demonstrable evidence of its presence, except that it is a glowing ball when it can be viewed.

Blindsight is described as:

A blind-sighted creature can perceive its surroundings within a certain radius without having to rely on sight. Creatures without eyes like oozing and creatures with echolocation or raised senses like bats and true dragons have this meaning.

So it seems the type of blind sight is important. Echolocation would recognize the presence of the sensor (since it is a physical manifestation), but as formulated, heightened senses would not do so unless you decide that the sensor gives a formal indication of its presence, that of Blindsight could be detected.

What would blind sight mean for an Elder Oblex? When I walk past the Oblex stat block, I wouldn't say. It has no ability to assume that it could recognize a silent, floating, invisible ball

dnd 5e – How does blindsight complement truesight?

While the definitions are pretty clear,

Blindsight beings:

A blind-sighted monster cannot perceive its surroundings
rely on seeing within a certain radius.

Creatures without eyes, like grimlocks and gray oozing, usually
have this special meaning, just like creatures with echolocation or
heightened senses like bats and real dragons.

If a monster is naturally blind, it has a note in parentheses
Effect that indicates that the radius of his blind sight defines it
maximum range of his perception.

and truthfulness is:

A truthful monster can see normally up to a certain area
and magical darkness, you see invisible creatures and objects,
Detect visual illusions automatically and save throws successfully
against them and perceive the original shape of a shapeshifter or one
Creature that is transformed by magic. In addition, the monster
look into the etheric plane within the same area.

It is easy to see that everyone has their own applications. However, there seems to be a number of overlaps between these senses when it comes to visual illusions that raise many questions, most of which are worded as follows:

Does a creature's blindsight ____________ like truesight?

e.g .:

  • Does blindsight allow a creature to see in normal and magical darkness?
  • Does blindsight allow a creature to see invisible creatures and objects?
  • Does blindsight allow a creature to automatically detect visual illusions and save throws against them?

I apologize if this is a double question as I am sure it has been asked before but since I did not find it in the search I thought it would be interesting to see the comparison between these two types of senses and to focus on what is similar between them.

dnd 5e – Can blindsight through walls see?

It depends on.

Let's say you speak of 5e-dnd:

A blindfold creature can perceive its environment within a certain radius without relying on seeing. Creatures without eyes, such as B. Amounts, and creatures with echolocation or heightened senses, such. B. bats and real dragons, have this sense.

The rule does not say what blocks blindness in general, but I would rule it based on the nature of the mind. Vibration-based senses such as streaks may be able to penetrate walls and floors, while bats behind solid walls are unlikely to be detected. Fragrance-based blindsight may depend on the nature of the obstacle. Walls block more than bushes.

It is up to the DM to decide for each creature and environment.

dnd 5e – What would a balanced Eldritch Invocation be that includes blindsight?

I've tried to invent an Eldritch Invocation that gives the sorcerer blindfold, but I'm not sure how far that blindfold will last. Initially, I thought it would compare to the pre-existing invocation of Devil's Sight, which grants 120 feet of dark vision through magical and non-magical darkness, but blindness is (obviously) far superior to dark, so I've left that comparison. Suggestions on how far the blindsight should go would be very welcome.

I had hoped that this Blindsight Eldritch Invocation would not have Warlock Level or Pact requirements, but I would be willing to add a level requirement if absolutely necessary.