Wight

Etymologically the English wight descends from Old English wiht (Middle English wight/wiȝt) and is cognate with Old Norse vættr/ vættir and related North Germanic forms; the lexical family denotes a created being or 'that which exists'. In medieval Christian contexts the term was used within an ontology distinguishing created beings from God and could be applied across a moral range (including saints in some texts). Over time during Middle English and later literary developments the term's semantic range shifted and was reinterpreted in different registers, including a later literary narrowing in modern fantasy to particular undead figures.

No single, consistent physical form is attributed to a 'wight' in the historical material: Old English usages can apply the term to ordinary human figures and to monstrous agents in epic poetry (for example the lexical field includes characters like Grendel or the dragon in Beowulf when translated as 'creature' or 'wight'), while Old Norse and later Scandinavian cognates occur in contexts for local nature and household beings (vætter/vættir, vätte) that are commonly imagined in folklore as small humanlike land- or house-spirits. Thus traditional appearances range from mundane human persons to small nature-spirits to monstrous beings, with the modern fantasy undead depiction arising as a later, genre-specific innovation rather than reflecting the older folkloric range.

Abilities and behaviours vary with the subcategory indicated by the term: as a generic 'created being' no special powers are implied; as Old Norse vættir the term appears in compounds denoting land-vættr (guardian spirits of place), bjargvættr (helping sprite), and mein-vættr (evil wight), indicating roles that include protecting, aiding, or harming depending on type. Medieval uses sometimes extend to sanctified figures, reflecting protective or sanctified capacities in certain registers. Modern fantasy sources attribute undead powers (life-drain, reanimation) to 'wights', but those traits are literary developments distinct from the broad historical semantic field.