Nyctophiles

Nyctophiles are immortal, humanoid, highly dangerous monsters that inhabit the Nocturnal Realm.

They don't need to eat to sustain themselves, however, they are bloodthirsty creatures that will never give up an opportunity to hunt down and slaughter (especially human) prey.

Weapons made out of silver inflict severe wounds on nyctophiles.

They can perfectly see in the dark. Direct sunlight (from the Sun or conjured by magic) kills them, turning them into piles of ash and cinders. Other kinds of light don't harm them, but only hamper their vision. Nyctophiles die the same way as normal monsters.

There are currently only three known nyctophilic creatures: werewolves, vampires and ghouls.