What does the term 'draugr' refer to?

The term 'draugr' specifically refers to beings from Norse mythology associated with the dead, particularly those who are thought to rise from their graves. Draugr are considered to be the spirits of the deceased who have taken on a physical form, retaining some semblance of their former life while exhibiting supernatural powers, including strength and the ability to change their appearance. They are often described as protecting treasures buried with them, thus acting as guardians of their graves. This aligns with the notion of them being ghosts or undead entities that hover around their burial sites.

The other options suggest supernatural themes related to other folklore elements. For instance, while vampires and curses may involve themes of resurrection or transformation, they do not accurately encompass the Norse context of draugr as guardians of graves or their distinct characteristics. The description of spiritual entities tormenting the living might seem related, but it doesn't reflect the unique role of draugr in mythology, where their purpose is often linked more to protection of their burial sites rather than active harassment of the living.