The blessing of the protective talisman involved the master personally chanting scriptures to imbue the talisman with so-called magical power.
Of course, this magical power was not true magical power in the literal sense. It was more about the merits and good intentions associated with it.
After Master Jeevika consecrated and blessed the amulet, he gave it back to Nanako and said, "Please keep this amulet. If you are interested, you can study more Buddhist teachings. With your talent, you w