I read the dictionary so you don’t have to. The selection below could, in my opinion, be well employed in horror stories and casual Halloween party conversation:
“You look positively sepulchral.”
“Why, thank you!”
Eldritch: Weird, ghostly, unnatural, frightful, hideous. (Of obscure origin. Potentially something to do with elves.)
Gloaming: An Old English word for twilight. (Useful now the latter has become synonymous with sparkly vampires.)
Imbrue: To stain, especially with blood.
Lambent: Of a flame (fire, light): Playing lightly upon or gliding over a surface without burning it, like a ‘tongue of fire’.
Lycanthropy: The transformation into werewolf form.
Mizzle: 1. Misty rain (modern). 2. A sudden or surreptitious departure or disappearance (rare/archaic).
Rutilant: To shine with a reddish glow.
Sepulchral: 1. Pertaining to the tomb or interment. 2. gloomy; dismal. (From the Latin Sepultra: to bury.)
Susurration: Malicious whispering.
Definitions were checked in the OED. Those are just a few words I’ve come across lately and enjoyed. Please add your favourites – leave a comment!