Pennywise

Described as a mysterious, eldritch, demonic entity of evil, It is a monster of unknown origin that preys on Derry's children and humans every twenty-seven years. IT finds striking fear in children akin to seasoning or "salting the meat". It can manipulate people and use them as pawns in doing its bidding, either by assuming a form familiar to them, promising them their desires or through subliminal influence. Because of this control over what happens in Derry, many of the child murders It commits are never solved; the adults of Derry act as though either nothing is happening or they have forgotten about It.