Vardøger

There is no single canonical origin tale in the provided sources. Etymologically the term comes from Old Norse varðhygi (vǫrð 'ward/guardian' + hugr 'mind, spirit'), placing the concept within Norse attendant-spirit taxonomy. Secondary sources identify vardøger as originally considered a fylgja and/or vǫrð (guardian or attendant spirit). The phenomenon also has an analogue in Finnish folklore known as etiäinen.

Vardøger is primarily reported through sensory traces rather than a single fixed visual form: footsteps, voice, scent, and an overall likeness or demeanor that faithfully reproduce the person. Some accounts (via etymological and comparative notes) describe an older conceptual strand that represents a human's inner essence manifesting as an animal resembling the person's character, reflecting its link to fylgja/vǫrð traditions.

The vardøger precedes its associated person, producing convincing sensory evidence (sound, scent, voice, visible likeness) that the person is already present. This can create a reverse-déjà-vu effect where witnesses believe they have already seen or heard the person. It has been likened to a phantom double or a form of bilocation. Sources portray it with a less sinister connotation than a doppelgänger and associate it with guardian/attendant spirit roles rather than malicious agency.