How to crack the buried steel bar at the top of the tomb

According to my dad, there are two reasons for inserting steel bars into the grave:

1. Ghosts in the grave will come out of the grave to make trouble for the dead, endanger their families and make them sick for no reason. Then the family can't help it, so they will insert a steel bar to stop the ghost.

2. Some people want to harm this family, settle the ghosts in the grave and ruin their geomantic omen.

The solution is to find a good fairy.