Norse mythical creatures.
Werebear/warrior. Warriors would howl and foam at the mouth and go crazy in battle. Laid out after death on bear skins, in the stories they actually turn into bears. Thor is mentioned in one text to have fought an entire island of female berserker.
Undead monster with insatiable appetite. The strength of the will of the dead forces the “hugr” spirit to return to the body which usually haunts the grave, protecting the dead person’s treasure. They die a second death if burned, dismembered, destroyed or the body rots too much. They have super human strength, increase size and weight at will and stink of decay. Some retain some intelligence and many go after people that wronged them in life.
Can rise from the grave as smoke or “swim” through the rock to escape their grave. They kill their victims by devouring their flesh, crushing them, driving them mad till they kill themselves, or by drinking blood. They also effected anima