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Spectres are the partially invisible counterparts of Demons. Except for their blurry appearance, they are exactly the same in behavior and attributes and thus may be thought of as Demons who have a permanent partial invisibility power. In the Doom and Doom II manual, their description is: Great. Just what you needed. An invisible (nearly) monster. And in the PlayStation, Saturn and Doom 64 manual adds, These beasts will eat your face off, did you expect a walk in the park?

Spectres don't have frames of their own, as the Doom engine uses the same information used for Demons to account for them, which means the monsters share sprites.

Spectres appear as "shimmering" beings, like a lens which distorts and refracts the area seen through their translucent bodies, making them hard to spot in darker areas or against certain textures (such as grey speckled walls). However, in bright areas, they are noticeably visible and "spotty".

Data

Attributes
ID # 58 (decimal), 3A (hex)
Hit points 150
Speed 10 map units per frame
(175.0 map units per second)
Width 60
Height 56
Reaction time 8
Pain chance 180 (70.31%)
Pain time 4 tics
Mass 400
Bits 4194310
Bits list

1: Obstacle

2: Shootable

22: Affects Kill %

Sprites and sounds
Sprite name SARG
Alert sound DSSGTSIT
Action sound DSDMACT
Pain sound DSDMPAIN
Death sound DSSGTDTH
Melee attack
Damage 4-40
Sound DSSGTATK

Damage done by a Spectre's bite

Bites needed to kill1 Mean Standard
deviation
Min Max
Player (100%
health, no armor)
5.16 1.20 3 9
Player (100%
health, security armor)
7.32 1.33 5 11
Player (200%
health, combat armor)
18.86 1.60 15 22
Barrel 1.50 0.66 1 5
Trooper 1.50 0.66 1 5
Sergeant 1.97 0.77 1 5
Wolfenstein SS 2.98 0.95 2 7
Imp 3.29 0.99 2 7
Chaingunner 3.84 0.99 2 8
Lost Soul 5.16 1.20 3 9
Commander Keen 5.16 1.20 3 9
Demon 7.48 1.31 5 11
Spectre 7.48 1.31 5 11
Boss Brain2 12.15 1.59 8 17
Revenant 14.31 1.57 11 18
Cacodemon 18.86 1.60 15 22
Pain Elemental 18.86 1.60 15 22
Hell Knight 23.52 1.50 19 27
Arachnotron 23.52 1.50 19 27
Mancubus 28.15 1.35 24 32
Arch-vile 32.84 1.30 30 36
Baron of Hell 46.72 1.79 42 51
Spiderdemon 139.43 2.32 134 144
Cyberdemon 185.64 2.97 180 192
  1. This table assumes that all calls to P_Random for damage, pain chance, and blood splats are consecutive. In real play, this is never the case: counterattacks and AI pathfinding must be handled, and of course the map may contain additional moving monsters and other randomized phenomena (such as flickering lights). Any resulting errors are probably toward the single-shot average, as they introduce noise into the correlation between the indices of "consecutive" calls.
  2. Assumes that direct hits are possible, which does not occur in any stock map.

Appearance statistics

In classic Doom, the Spectre is first encountered on these maps:

Game ITYTD and HNTR HMP UV and NM
The Ultimate Doom E1M6: Central Processing1 E1M5: Phobos Lab1 E1M3: Toxin Refinery
Doom II MAP03: The Gantlet MAP03: The Gantlet MAP03: The Gantlet
TNT: Evilution MAP04: Wormhole MAP02: Human BBQ MAP02: Human BBQ
Plutonia MAP02: Well of Souls MAP02: Well of Souls MAP02: Well of Souls

The IWADs contain the following numbers of Spectres:

Game ITYTD and HNTR HMP UV and NM
The Ultimate Doom 51 102 183
Doom II 37 93 175
TNT: Evilution 83 150 224
Plutonia 95 102 111
  1. May be encountered earlier if the secret level is played.