The Weird West
According to Jack, the Hateful Thing is a creature that preys on travelers by fomenting xenophobic suspicions in the people around them until they are murdered, at which point the creature eats its victims’ souls.
The Hateful Thing takes the shape of a black dog with glowing red eyes. It seems able to vary its appearance somewhat; when first encountered by the party in Dodge City, it looked like a scrawny mutt. It has since grown into a gigantic hound.
The Hateful Thing appears to be resistant to bullets, but arcane attacks seem to damage it normally.