Here's another Ghoul type enemy called, Eye Spook...which is a play on words for "I spook". One thing to note about Ghouls, you cannot hit a Ghoul without "Spectral influence". Meaning you must have some kind of spectral properties before you can engage a Ghost, especially. But, Ghouls are incredibly strong compared to Gamers. So, I wouldn't suggest fighting a werewolf, zombie or the latter either.