Death's Door is a portal that opens upon the world that the Burning Legion uses to breed their fel hounds and other canine-like terrors.  Any time that you see one of those creatures, that is where it came from, and it passes through here, first.$B$BLately, we became aware that the Burning Legion have ramped up their summoning of these creatures through the portal.$B$BYou must shut down Death's Door before it becomes an inexorable tide, and all is lost!