A draugr is an undead creature from Norse mythology, a subset of Germanic mythology. The original Norse meaning of the word is ghost, and older literature makes clear distinctions between sea-draug and land-draug. Draugar were believed to live in the graves of the dead, with a draugr being the animated body of the dead. As the graves of important men often contained a good amount of wealth, the draugr jealously guards his treasures, even after death.
Contributions by 184.108.40.206, The1truesushiboy, and Eilev G. Myhren.