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In page Draugr:

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One of the best-known revenants in the sagas is Glámr, who is defeated by the hero in Grettis saga. After Glámr dies on Christmas Eve, "people became aware that Glámr was not resting in peace. He wrought such havoc that some people fainted at the sight of him, while others went out of their minds". After a battle, Grettir eventually gets Glámr on his back. Just before Grettir kills him, Glámr curses Grettir because "Glámr was endowed with more evil force than most other ghosts",[1] and thus he was able to speak and leave Grettir with his curse after his death. (Note that the saga does not actually use the term draugr for Glámr, per above.)[citation needed]