|The following is based on pre-release information for the canceled online game codenamed Project V13 and is not considered canon.|
The Hounds of Hell is a faction mentioned in The Armageddon Rag, Vol. 4.
The Hounds of Hell is a faction whose members can be identified by a tattoo of a snarling dog, usually on the arm. They are at odds with another faction known as the Torn Sky.
The Torn Sky are mentioned only in the short story J. Hardy and the Death Blankey, published in The Armageddon Rag. They were likely to appear in Fallout Online, the original Project V13; this was abandoned in favor of an unrelated project by the same name.