Terror Radius

"Maybe it is the will to survive that makes me even more alert to sounds. Sight is limited in this darkened part of the world. In this case their heartbeats. Not my own, but instead the Killers' as they close in on me. I just hope that they do not pick up on mine as my heart races for every thump I can hear even clearer."

- Benedict Baker's Journal, Nov. 1896

"Again, my senses have proven to be the keys to my survival. If my heartbeat rings in my ears, the Killer is close. If I see the "red stain" in my surroundings, the Killer is even closer!"

- Mysterious Note

The ''' is an integral Game Mechanic in '.

Overview
The Terror Radius is a feature intended to induce fear and anxiety in Survivors, causing them to experience The Heartbeat, a sound effect triggered whenever Survivors enter the Killer's Terror Radius and intensifies with proximity.

Terror Radius
For most Killers in Dead by Daylight, their Terror Radius is decided by their base Movement speed: ' for those moving at ' and ' for those moving at '.

However, some Killers do not follow that general rule and either have a different Terror Radius altogether or even multiple Terror Radii, as can be seen in the Table below.

Heartbeat
The Terror Radius causes a Survivor's very own heart to beat audibly. The Heartbeat sound effect will get louder and quicker the closer in proximity the Survivor is to the Killer. That it is indeed their own Heartbeat and not the Killer's, as Benedict's journal entry would imply, is confirmed by a Mysterious Note found in The Fog and by the actually visible, beating heart Dead by Daylight Mobile introduced into the Survivor model as a replacement for the audible Heartbeat in cases of Players playing without sound.

Terror Radius Music
The Terror Radius Music plays for Survivors whenever they are inside the Killer's Terror Radius. The music gets progressively louder and more aggressive the closer in proximity the Killer is to them, but outside of a Chase.

Older Killers generally use one of  available generic Terror Radius Music themes, whereas newer and reworked Killers have their own, unique Terror Radius Music.

The Terror Radius Music has  layers to it; whenever the distance between a Killer and a Survivor undercuts the next quadrant of the maximum Terror Radius distance, the music seamlessly transitions to the next layer, which can be used to accurately gauge a Killer's proximity, based on the knowledge of a Killer's default Terror Radius range, given that the Killer does not use any Terror-Radius-altering Unlockables.

Chase Music
Killers do not hear their own Terror Radius music, instead they hear the general background music that plays on all Maps. It is only when a Survivor initiates a Chase that the background music will be replaced by the Chase Music. For all Killers that do not use either of the three generic Chase Music themes, the Chase Music is the same as the fourth layer of the Terror Radius music Survivors hear, which for them plays when the Killer is at closest proximity.

Two Killers were an exception to this and had a unique Chase Music, until that was changed to the fourth layer of their Terror Radius as well: The Demogorgon and The Oni. Their unique Chase Music is still present in the files in the Table below.

Akin to the Terror Radius Music, older Killers use one of  available generic Chase Music themes, whereas newer and reworked Killers have their own, unique Chase Music.

Lullabies
Some Killers, in addition to their Terror Radius, feature what is referred to as a Lullaby. The name of the mechanic was derived from The Huntress' Lullaby, as she was the first Killer to feature one, and it is a literal children's lullaby in Russia. Some newer Killers may have alternate names for the mechanic, but those are still considered Lullabies as far as game mechanics are concerned.

A Lullaby works differently to the Terror Radius in the following ways:
 * Lullabies are non-directional.
 * Lullabies have a fixed, unalterable range.
 * Lullabies are unaffected by Unlockables changing the range of the Terror Radius.
 * Lullabies cannot be suppressed with the  Status Effect.

The following Killers have a Lullaby:
 * The : hums a literal Lullaby
 * The : emits a Nursery rhyme in the Dream World
 * The : Victor's Shrieks
 * The : emits a Melody

Fake Terror Radii
Some Killers have the ability to alter their Power in a way that produces a fake Terror Radius, which serves to confuse a Survivor.

Fake Terror Radii do  interact with any Unlockables, such as like  or  (charging up Tokens) or  (triggering the  Status Effect).

Examples of a fake Terror Radius is that emitted by The Hag's Mud Phantasms or the Illusionary Terror Radius induced by The Doctor's Add-ons.

Undetectable Status Effect
There are several Unlockables, as well as Killer Powers, that can temporarily cloak a Killer's Terror Radius, all of which apply the  Status Effect.
 * The cloaking himself and entering the Spirit World.
 * The using the  or the.
 * The using the.
 * The while remaining in Evil Within I.
 * The using the.
 * The using the.
 * The crouching.
 * The using Night Shroud.
 * The after traversing the Upside Down.
 * The using the.
 * The using the.
 * The using the.
 * The using the.

Patch 1.8.1

 * Increased The Nightmare's Terror Radius to 24 metres from formerly 16 metres.

Patch 1.9.3

 * Decreased The Hag's Terror Radius to 24 metres from formerly 28 metres.

Patch 2.5.0

 * Increased The Pig's Terror Radius to 32 metres from formerly 28 metres.

Patch 2.6.0

 * The intensity of the Terror Radius is now also scaled based on the vertical distance, in addition to the horizontal distance.

Patch 2.7.0

 * Increased The Legion's Terror Radius to 32 metres from formerly 24 metres.

Terror Radius Examples
The following table lists several examples of resulting Terror Radii when using Unlockables that affect it in some way:

Trivia

 * Unlockables that affect a Terror Radius via a percentage tend to apply that on top of the base Terror Radius, ignoring other Unlockables that affect it by a concrete numerical value.

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