The Forest of Demons

The plaque that Albert finds In the forest roughly translates to: "Bad people who helped in ritual sacrifice lie here. They believed in evil and demons so much that they became creatures of evil. They are close to Satan and whoever wrote this plaque will soon join them. The people who wrote the plaque didn't have the strength to join them but they will later, and their time will come."

There are several moments in the film where one can see that the Demon's heads are just rubber masks.