Ghoul

Ghoul is a small, fast nyctophile.

Appearance
Ghouls are probably the most ominous looking nyctophiles.

They look like small, slim humanoids with pitch black skin. They have long faces that lack a nose, pair of glowing, greenish eyes and a mouth full of sharp teeth, frozen in eternal grin.

Ghouls have long, razor sharp claws on their forelimbs.

Behavior
Ghouls are small and black, so it's hard to notice them in the darkness of Nocturnal Realm. They stalk their prey silently and attack without warning, jumping on backs of their victims and slashing them with their claws. Ghouls inflict nasty, bleeding wounds. Smell of blood sends them into savage frenzy.

Trivia

 * Non-magical humans who had seen ghouls have created urban legends such as The Rake or Dover Demon.