The Lost Wedding Ring - Thanara

You’re on your typical weekly mountain trail walk when you spot something shiny in the underbrush. Picking it up to inspect it, it’s a ring, a black ring with what looks like obsidian gems engraved in it……you take it home and after about a week, you finally try it on……it fits perfectly…….the room grows icy cold and there’s a sudden knock on your door……who could it be?