Chenquin
It's said that it came from the ocean. What's known for sure is that it comes with the rain.
People are terrified of it. That is understandable. It would be terrifying for you if it was your child who disappeared.
It is called many things. Spirit, specter, will-o'-the-wisp. It prefers the name Chenquin.
The Chenquin comes at night with the darkest of storms. It hides in the resonance of raindrops and its voice is the sound of wind over water. In its body are trapped screams, almost impossible to hear. Just its watchful gaze is enough to make a child sit up straight and listen.
The Chenquin guides the child down streets, over wood and stone. They travel until they reach the sea. The Chenquin goes out into the ocean with its silent screams, trusting the child to follow.
At this point the child may hesitate and turn back. He may wander lost for a few days until he is found. He would return to bed and pretend it was all a dream. Never again would he hear the sound of the ocean.
Or the child may follow the Chenquin into the cold, dark water.
Come, whispers the Chenquin as the child begins to drown. It takes the child's ghost and guides him to the surface. Lost, confused, the child would wander the seas, crying for help.
For every child lost, another scream disappears from the Chenquin. Some say if enough screams disappear, the Chenquin will return to what it was: a little boy, cursed and lost at sea, crying out for his family.