It has no formal name, and is called "Satan" by the deeply religious couple Jonathan and Jean Rose. It usually reveals its head and hardly reveals its body. The creature is shown to have a large head and four retractable claws on the end of long tentacles, one on each corner of its face. It is described in the Journal entry image as a unique mutation with an incredibly tough carbonized exoskeleton made from compressed coal.
Satan's precise origin is unknown; it is said to have suddenly come up from the mines below Mount Pleasant and devastated the town. Efforts to kill it proved futile, and hundreds of people were killed in the first month after it appeared. According to Jonathan Rose, a recent hunting party of twelve was sent to hunt down Satan that only resulted with one survivor, who lost his arm and half a leg. Joseph Capelli and Jonathan Rose hunted down the creature, though Satan badly wounded the latter. Ultimately the creature was killed by Capelli as it tried to corner him in a service elevator.
This Chimera serves as a boss in the mines of Mount Pleasant. Its body is invincible, and cannot be hurt by gunfire of any kind. However, this is not much of a problem, seeing as how Satan rarely ever shows its body.
Much of this fight is pretty much scripted. The first part involves running through the tunnels away from Satan, as it attempts to kill Jonathan and Capelli. Simply follow John during this part to stay alive. However, if you start to fall behind, you will be killed.
Eventually, Satan will smash its head through a wall, and attempt to kill John and Capelli. During this part, the player must shoot the massive Chimeras' eyes to temporarily blind it. The Bullseye or carbine are recommended to attack the eyes due to their high accuracy and rate of fire.
When Satan is blinded, the player must then throw an acetylene tank into its mouth and then shoot the tank to detonate it and cause major damage to the beast. Satan will then back off, and John will beg you to go after it and kill it, as he cannot due to the fact that he was injured in the battle.
The player must then run through a series of tunnels again, while being chased by Satan. Make sure to retreat into the smaller tunnels as much as possible, as you will not be able to outrun it. Just keep retreating into the tunnels while moving forward, and you should be able to stay alive.
The final part of the boss battle is very similar to before, except this time Satan will actually burst through the wall into the room with Capelli. You have to retreat into a small recess in the side of the room to survive.
Satan will then attempt to eat you, but won't be able to reach you in the recess. Simply shoot its eyes again to blind it, then throw an acetylene tank into its mouth. Shoot the canister to detonate it, and Satan will finally die, by having its upper jaw almost completely blown off.
This feral monster is the product of years of incubation in the coal mine of Western
Pennsylvania. It is a biological and evolutionary mystery.
Doctor Malikov's journal entry on Satan states that the exoskeleton may be harder than diamond, adding "is this possible?" This seems to imply the exoskeleton is made from carbon nanotubes, a form of carbon which is indeed harder than diamond and which Malikov would be unlikely to be familiar with.
In the church, one of Satan's tentacles will burst through the floor and drag a Grim underground, implying that without humans to feed on the giant creature has turned to eating other feral Chimera.
Satan appears as a background character in Sony's Playstation All-Stars Battle Royale. He appears in the Time Machine stage.
Satan can infect Grims by spitting saliva on them (similar to Leech when exploded).