Cucuy: The Boogeyman

When children start disappearing, a rebellious teen under house arrest starts to suspect that a legendary evil, a boogeyman known as the Cucuy, might be responsible.

Cucuy appeared in 2018 movie called Cucuy: The Boogeyman. Cucuy is a Mexican version of the Boogeyman who's been known to kidnapped children and kill everyone and it was summon by Mrs. Fuentes as a revenge on those who killed her daughter, and he keeps the souls of those children that he collected in his sack aka the cave, but in order to free the souls of the children someone has to kill him.