Board Thread:Suggestions forum/@comment-25931200-20190120231706/@comment-26005323-20190413052209

You normally cannot see elvish fear floating about in the world. You need to enter the wraith world, which is one of the reasons the elves of Eregion builded the Rings of Power. Elvish fear can refuse to enter the Halls of Mandos, but that is usually because they were afraid of the judgement they'd find in Mandos, thus in a way those who remained in Middle Earth as diembodied fear are techincally guilty of some crime, at least before the elves faded, which happened in the Fourth Age and beyond.

IIRC there's a theory that the barrow-wights are elvish fear activly seeking out bodies.