probably the are the ghosts of dead nephilim, and nephilim are angel/human happas. when people die they go to hades or to heaven, but nephilim spirits get stuck here on earth in the back rooms of reality. they possess people to experience vice, to delay the second coming of christ by expanding sin, and to kill humans by suicide or otherwise. they are not the same thing as fallen angels (who don't need bodies to exert power, and are more interested in states than individual people)
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