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A guecubu resembles a mass of vapor, and is born from dreamstuff tainted by evil. Guecubus can possess and control the body of sleeping humanoids. Once they are in control, they 'ride' silently, letting their victim go about his or her business. At some point they take control and lash out, trying to spread death and murder – particularly the victim's family and friends. Sometimes the guecubu will conceal its actions even from the victim, letting them believe that they are cursed or jinxed.
Guecubus believe that killings form some sort of pattern, and enough spilled blood will eventually reveal the meaning of creation in this pattern. They rarely form groups with other guecubus, preferring to remain hidden and anonymous. However, many of them can be found in the Dreaming Gulf (230th layer of the Abyss), where they are created spontaneously from the raw, churning chaos of dreams.
The Demonomicon of Iggwilv speculates that each breed of loumara evolved from the dreams of a different dead god, and that their natures are a corruption of that god's portfolio. The guecubus from those of a god of law and peace
Guecubu • Manitou
Alkilith • Arrow demon • Babau • Balor • Bar-lgura • Cerebrilith • Chasme • Glabrezu • Goristro • Hezrou • Immolith • Kastighur • Klurichir • Mane • Marilith • Maurezhi • Molydeus • Nalfeshnee • Orlath • Sorrowsworn demon • Succubus • Uridezu • Vrock • Yochlol
Bebilith • Dretch • Ghour • Kazrith • Quasit • Retriever • Shadow demon • Wastrilith • Yochlol