Mysterious Stone

There was a monk who loved in doing pilgrimage. One time, he traveled to an old temple and found a black stone in shape like the boundary marker stone of a Buddhist temple. He brought that stone back with him to his temple….After that, there were many unusual things happened to him even when he meditated. His mother was injured by a fallen broken pillar hit right on her back. Is this a curse of that black stone? DMD has the answers.