The Consuming Fire. A CAIN One-Shot I wrote and ran.
Sarah Oldacre and her twin sister Tabatha were raised in a white supremacist cult founded by their father, pastor Gideon, and his old war buddy, Michael, in the Pacific Northwest. The cult has kept afloat by managing hunting grounds from which it takes its name: Fatherland Lodge, and it has gathered vulnerable youths, criminals, ex-cons and other such dregs of society as its members.
Gideon, with military rigor, has taught his daughters and flock that in the outside world prowl jihadists, immigrants and others he considers anti-Christian heretics, told of in tales of Gideon's time as a marine during the Gulf War. His twisted intentions were to rehabilitate and give purpose to his wayward followers, but all he could muster was the creation a criminal militia, dealing equally in drug trafficking and violent crime. And, to keep the flock in line, brutal Michael has lied about being a great counter-terrorist, burying the bodies of his victims in the garden of Fatherland.
In a drunken moment during the night of the 11th of September of 202X, Gideon reveals to his daughters that there are no remains in the pit, breaking their vision of reality and making Tabatha flee the compound. Sarah, who refuses to go with her twin, reinforcing her fanaticism, and in her resentment for the weakness of her family, summons the HOUND SIN of the IFRIT from her deep within her indoctrination.
The SIN murders Tabatha, who's found in the afternoon of the next day by Daniel, Sarah's erstwhile boyfriend. Tabatha declares a state of emergency in Fatherland and hides herself in its grounds. She then calls a group of criminal cleaners to cover up the murder of her sister, who she thinks some terrorist has killed. The Exorcists will pass themselves as the cleaners to vanquish the IFRIT.