Ask for the name of this movie. It's probably about monsters that haunt at night making holes in the grass and hurting people. There are also several people looking for monsters together.

The 2008 American film The Mysterious Cave

Starring Sean Patrick Thomas

Kensuke

1879, western United States. Coffey (played by Carl Gray), a young Irish immigrant, settled in the Dakota Plain. Just when he was full of joy and wanted to marry the bride, the nightmare truth was placed in front of him. The farm of his fiancee's family was attacked by an unknown object, and the man was killed, and all the women and children were spared. At first, people speculated that the murderer might be an uncivilized and cruel Indian. In order to live a stable life in the future, Coffey joined a team composed of ranch workers and cavalry brigade to find the real murderer, led by a grumpy and simple-minded guy-Henry Victor. Coffey formed a group with a boy and a freed slave. They soon discovered a mysterious cave that inexplicably appeared on the flat ground, and a girl suffering from catatonia was buried in the dust. All this implies that they are not looking for an ordinary creature. Behind this seemingly calm grassland, ferocious enemies are approaching them step by step. ...