An Advanced Creature Profile by Vincent Groth.    

The basic incorporeal undead include the Haunt, the Lelora, the Bogey, Bogeymen, and Eidolon. Whether forming naturally or created by outside forces incorporeal undead are dangerous. Consecrated ground, salt, and silver can help protect and repel these undead creatures. 

-The most basic of the hostile spirts is the Haunt. One of the only spirits that keep part of its mortal form with it. Formed around their skulls or head letting loose weeping cries. 

-The Lelora are highly hostile spirits, misclassified as undead, they take the form of spectral children appearing only at night. They weep and call out and try to lure good Samaritans into swamps, rivers, and other hazardous places. They tend to have a blood red tint to their tattered forms. 

-The Bogey is a small spirit appearing as a floating malformed head surrounded by shadowy fumes. They are composed of the tattered remnants of many souls either from necromantic arts that damage the soul, pieces of a soul let go when moving on from something once deeply important, and when souls with earthly wants remaining but moves on anyways. They mass together forming a creature of primal hunger. 

-The Bogeyman is a large vaguely humanoid creature with a long stretched out face, a mane of spikey shadow hair, and long arms that reach to the ground even when standing up straight. They have large hands and larger claws. They are formed when several Bogeys manage to merge into one greater entity. Bogeymen are intelligent creatures beyond mere instinct.  

-Eidolon the tormented souls of a mortal ritually killed and bound. They resemble the twisted forms of their mortal lives tainted by all their insecurities taking away all the good qualities they might have thought they had and only leaving the amplified terrors of what they were and appeared as. 

Spirits tend to have a wide range of powers though these lower tiers of undead tend to be limited. 

-The Haunt’s powers are limited allowing them to fly, phase through solid matter, and be used as the eyes of their creator. They have no real means of fighting the living. 

-The Lelora can take the form of small children, mimic and throw voices, but have no real means of offense.  

-Bogeys can phase through solid matter and unleash terrifying wails. 

-Bogeymen are rather powerful for the class of spirit and can shapeshift, turn invisible, migrate to new haunting grounds, levitate, possess telekinesis, phase through solid matter, and influence small creatures in their domain. Bogeymen can solidify themselves and rip, slash, and choke those who upset these rather powerful spirits. 

-Eidolon are the most dangerous of the basic hostile spirits. Their claws can damage the soul; their presence chills an area and kills all sensation for extended periods of time where they pass through mortal flesh. They can’t pass through matter but are solid enough to interact with the physical world and while they can’t be harmed by mundane weapons can wield them. 

The Haunt and Eidolon are used as advanced undead servants with the Haunt serving as a spy, surveillance, and psychological warfare unit and the Eidolon serving as a guardian of lairs and dwellings of vile creatures. Lelora are wild vicious spirits who feed off the deaths of mortals generally those they manage to lure or trick into dangerous areas. Bogey and Bogeymen feed off Fear and as such are not openly dangerous wishing more to spook rather than harm the living. Bogeymen generally have a positive influence on an area driving off or killing active threats to their prey.  

The Haunt, Lelora, Bogey, Bogeymen, and Eidolon are all barred from entering holy places. They can’t cross over lines of salt and salt harms their incorporeal form. Silver causes them harm, Bogeys and Bogeymen are especially vulnerable to silver. Eidolon are vulnerable to Iron, the purer and older the more potent it is.