imagine like a people , grown in labs , not natural , so some can with magic rituals invite and trap entities in side of them , then revive them....

and those entities do not belong here....
in past times , they came to this solar system to feed upon ... read 50 mill years ago...
destroyed humans long time ago....
that is why we have 2 pair of dnk strands instead of 12....
those pretended to be gods while those are ...leeches...