Spirit

Kvasir of Midgarth lists the undead spirits by their signs: the banshee that heralds death, the revenant that walks the night hours, and the malign spirits craving the bodies they lost. Spirits resemble ghosts but are stronger and more varied. Ethereal, they can take a near-transparent human shape and manifest enough to affect the living, though, being tied more tightly to the spirit world, they have less physical power here than ghosts. There are three kinds, alike in look and nature but different in purpose and power.

The banshee is usually a female spirit tied to one place, normally an ancestral home. It is seldom seen, but its cries in the night give it away. It is famous for foretelling deaths in its family: the night before a relative dies, its wailing warns of the loss. Turned on the living, that wail can drive them mad.

The revenant suffered some injustice in life and refuses to move on. From dusk to dawn it walks the earth looking for someone to carry out its revenge, and it can lay a curse or geas that compels a person to do so. Those who fail are haunted until they go mad or give in; once avenged, the revenant is free to rest.

Malign spirits are wholly evil. The poltergeist announces itself with senseless destruction, hurling small objects and hurting property or people, while the stronger kind tries to possess a living body so it can live again. Spirits seldom fight directly, but a touch steals life essence, and a victim killed this way has a 50% chance of becoming a spirit. Only silver or magic weapons affect them. All spirits fly and sense invisible, ethereal and astral beings within 200 feet. A save vs WILL resists a banshee's maddening wail or a malign spirit's possession, but a revenant's geas, which it can lay once a month, allows no save. A spirit keeps the level it had in life but is turned as at least 12th level.