Incubus is the final boss in Silent Hill encountered during the Good and Good+ endings. The Incubator is fought with the Bad and Bad+ endings. An easter egg seen in Silent Hill: Downpour gives the creature the alternate name Samael, and Dahlia Gillespie also refers to the creature by this name throughout the game when speaking of the Seal of Metatron.
This boss can only be battled if the player completes a side quest, that being the task of saving Michael Kaufmann. If Kaufmann is not saved, the Incubator will be fought instead. Due to the events of Silent Hill 3, the Incubus is the canonical final boss.
When Harry Mason confronts Dahlia Gillespie in the mysterious world known simply as Nowhere, she explains that Cheryl Mason had rejoined with Alessa Gillespie the moment they entered the town. With the two halves of her soul reunited, the God was able to mature once more and possess the body of Alessa, forming a new being called the Incubator.
As Harry steels himself for the final confrontation, Kaufmann inexplicably arrives, standing beside Harry. Kaufmann soon shoots Dahlia out of anger, and she collapses. Much to her horror, Kaufmann reveals a large bottle of Aglaophotis to her. Claiming more to be readily available, he hurls the bottle at the glowing form of the combined girls, where it shatters.
As the form collapses in pain, the beast known as Incubus expels itself through the Incubator's back. Because of the effects of Aglaophotis, the demon has been exorcised. The Incubus, while imperfect, still possesses the ability of flight and the use of deadly lightning. Demonstrating its capability, Dahlia is immediately struck with lightning, killing her. The Incubus continues to rampage but is soundly defeated by Harry Mason.
The Incubus seems to be based on Baphomet, a hermaphroditic deity that the Knights Templar were accused of worshiping before they were disbanded by the Catholic Church.
It appears rather feminine, as it has breasts, but has some male characteristics as well. It has the head of a bull or goat with two demon-like horns and no prominent eyes. It also has a pair of large wings. As a means of demonstrating its incompleteness, its abdomen appears to have rotted away, leaving only the spine visible.
In concept artwork, the Incubus appears with a metal object shaped into the Seal of Metatron on its back, but this is absent in-game.
The Incubus attacks with bolts of red lightning which inflict severe damage and, in some cases, can instantly kill Harry. The Incubus, similar to the Incubator, is completely stationary throughout the fight, so the only strategy needed to battle it is to dodge its barrage of lightning bolts and relentlessly attack it with Harry's most powerful weapon. A few clips from the hunting rifle will defeat it in a short amount of time.
Dodging the lightning Incubus expels during the boss fight can be difficult to entirely evade; the most effective tactic Harry can use is to run in a sideways circle, which will warrant him capable of avoiding all strikes. With PlayStation's button configurations, this can be achieved by holding down L1, square and moving the analog stick or D-pad in the direction the player desires Harry to run.
It is possible to kill both Incubator and Incubus without dealing damage. If the player uses up their ammunition before the fight and survives for a few minutes, the boss will react as if the final shot has been fired. However, this will not work if the player has the Hyper Blaster.
The Incubus is the manifested form of Dahlia's mental image of the Order's God. It is also possible that it may be a god in the Order, albeit not the supreme god. Samael/Incubus being a god of the Order is heavily supported by a specific memo found in Silent Hill: Origins, in which the author states Samael is the god worshipped by the cult.
The actual appearance of the Incubus was inspired by the representation of the theological deity Baphomet by Éliphas Lévi, which has been widely associated with the occult.
In real-world mythology, an incubus is the male counterpart to a succubus. The incubus is a demon who seduces his female, human victims as they sleep. This may possibly be a tie to Alessa; figuratively, one may imagine an incubus "seducing" her to a placid, helpless state, therefore warranting her mother and cult members to commence the ritual that they hoped would bring to fruition their god. This is supported by flashbacks in the game that show Alessa was highly reluctant to have anything to do with Dahlia's plans, only to later be rendered entirely devoid of her liberty.
In Jewish mythology, Samael is an archangel of death, sometimes even considered to be the illustrious Grim Reaper. However, in Jewish mythology, Samael (who, in this case, is male) is depicted as both commendable and contemptible in different cases. This may carry heavy symbolism in the game of what the Order's god genuinely is: a divine messiah in the eyes of the Order, but a malicious hellian through the perceptions of others.
- The song "My Heaven", which is played during the battle with Incubus, is the reason for the high-pitched noise during the battle, which was made by distorting the sound of a dentist drill.
- In the child's room Harry finds late in the game, there is a blue drawing on the ground that vaguely resembles the Incubus.
- After proceeding through the child's room and heading down the stairs, the player may take note that the second picture hanging on the wall looks very much like the Incubus. The deity seems crucified with wings folded.
- The Incubus makes a total of four cameos in other Silent Hill games.
- In Silent Hill 3, a picture of the Incubus can be seen on the right page of a book memo entitled "Silent Hill's Ancient Gods: A Study of Their Etymology and Evolution".
- In Silent Hill 4: The Room, Jasper Gein has an Incubus T-shirt with the word "Haures" beneath it, which is another name for Flauros.
- In Silent Hill: Shattered Memories, classroom 4D's projector in Midwich High School may display a drawing of the Incubus, depending on the player's Psych Profile.
- In Silent Hill: Downpour, there is an Incubus painting on the 1st floor (Archive/Offices) of the Centennial Building titled "Demon Samael".