Draugr or Draug - "the undead of Valheim", also called aptrganga or aptrgangr in the Norse literature. For Vikings they are considered as a threat for destroying their lands.(?) Draugr live in their graves, often guarding treasure buried with them in their burial mound.
Draugr are one of the most dangerous creatures in the realm of Valheim. You can find them at Swamp biome and protecting Abandoned outposts, Tombs and Ruins. They are hostile to Greydwarfs and will attack them on sight, but they seems to not care about Deers or Surtlings.
Draugr have 100 HP and deal 25 Damage with melee attacks.