Draugr

The draugar (singular draug or draugr) are revenants; a form of undead creatures often referenced in Norse Mythology. They are malevolent beings, though differ from other types of undead as they retain a form of intelligence.

Draugar are featured in Arc I of An Iceberg Outside Port Dawson.

Cause
As a type of undead, a person must die before becoming a draug. While the details of a draug's turning isn't known, it's thought to spread through bite. As a deceased and infected person does not turn immediately, it is assumed that there's an incubation period of at least a few hours and at most 2-3 days.

Prevention
It is possible to prevent an infected person from turning by the use of rituals and other similar magic.

Physical Attributes
It is suggested that there exists subspecies of draugar- one of which is the sea draug that the Dawson group encountered.

The draugar stink of death and decay. The sea draugr are described as being covered in sea weed and smelling distinctively like the sea.

Behavior
Draugar are shown to be malevolent and violent, with jealousy and greed being their primary motivation. Draugar are jealous of the living, as it longs for the life which it once had. This, along with its greed and hunger for flesh, causes it to viciously attack those who disturbs its grave. Despite this, draugar also exhibit some form of intelligence as they are capable of producing words and independent thoughts.

Draugar slay their victims through various methods including crushing them with their enlarged forms, devouring their flesh, devouring them whole in their enlarged forms, indirectly killing them by driving them mad, and by drinking their blood.

They prefer to be active during the night.

Weather Manipulation
Sea draugar are shown to be able to control the weather and the sea. Sea draugar are shown to favor heavy rain and storms.

Superhuman Strength
Draugar possess superhuman strength.

Size Alteration
Draugar can increase and decrease their size at will. They are also capable of altering the size of specific body parts.

Power Shouts
Draugar use the ancient magic of power shouts as a means of attack. Often taking the form of a shriek, draugar use this to paralyze and to harm their victims. It is possible that their shrieks is what potentially drives their victims insane.

Psychic Abilities
Draugar are shown to possess some sort of psychic abilities, as they could interlink their minds with another's and communicate through some sort of hivemind.

Weaknesses & Annihilation
Although preferring nighttime, the draugar do not appear to be vulnerable to sunlight like some other revenants.

Draugar are vunerable to silver, though the use of silver itself is not necessarily enough to kill it for good. Sometimes one is required to dispose of the body in unconventional ways to ensure it is truly dead, the preferred method being to cut off the draugr's head or burn the body, as fire is another weakness of the draugr’s.