Spectres are the partially invisible counterparts of Demons. Except for their blurry appearance, they are exactly the same in behaviour 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?
- The Spectre does not appear in the Doom II cast sequence at the end of the game.
- If a Spectre's corpse is crushed, the pool of gibs left behind continues to display the partial invisibility effect.
- In a ZDoom-based source port, if the player is killed by a Spectre (monster is credited with delivering the blow that reduces player's health to 0%), an obituary message is displayed at the top of the screen: "[player name] was eaten by a Spectre".
- In Doom95, the Spectre's sprite will reflect nearby objects like oil drums or corpses.