The Draugr is a resurrected dead person, often a viking or warrior, who leaves his burial mound to terrorize the living. It could also be a sailor who drowned at sea and were thus never buried in sacred ground. It is not a ghost in the usual sense, but rather an animated corpse.
These beings are often associated with navigation and the sea, especially in Norwegian Folktales, where the Draugen acts as a warning or omen of coming storms and accidents at sea.
In these stories, the Draugen is often described as a large and terrifying figure dressed in rags, with a pale and bloated face, and is sometimes seen standing at the helm of a ghostly, wrecked ship. He is said to be able to summon storms and lure sailors to their doom. Fishermen and sailors were especially afraid of encountering the Draugen, as he was considered an ominous sign.
If a Draugr shouted or called to the fishermen, it was wise not to answer, as doing so would cause the boat to capsize. These cries were interpreted as warnings of storms and death at sea, so when sailors heard these cries, they had better return to shore as quickly as they could.