The XXX is based upon what?
Nightbreed
Nightbreed (also Night Breed on publicity material, or Clive Barker's Nightbreed) is a 1990 American dark fantasy horror film written and directed by Clive Barker, based on his 1988 novella Cabal, and starring Craig Sheffer, Anne Bobby, David Cronenberg, Charles Haid, Hugh Quarshie, and Doug Bradley.
Cabal