The world's friendliest toy is catching flack from a priest in Poland.

In a presentation aimed at parents, Father Slawomir Kostrzewa claimed that Lego is a tool of the devil. The presentation was a response to the brick-building toy's Monster Fighters series, featuring ghosts, werewolves, vampires, mummies, swamp creatures and more. The set also features a team of monster-fighting people.

Image: Lego.com

"Friendly fellows have been replaced by dark monsters," he said. "These toys can have a negative effect on children. They can destroy their souls and lead them to the dark side."

The priest also cited research from New Zealand's University of Canterbury that found that happy facial expressions on minifigures has decreased since the toy's release in 1975. He claims this increases the toy's potential for evil.

This isn't Kostrzewa's first attack on a children's toy. Hello Kitty and My Little Pony have also been the subjects of his scrutiny.

Lego did not immediately respond for comment.