Also that retains some type of religion within the advantage of yantra as well as the mantras linked to it. You should also remember the Yantra is not a Instrument which is meant for the maniping or hurting of lots of people. मन्त्र ज्यो शत्रु भयो। डाकिनी वायो, जानु वायो। https://www.youtube.com/@Mahavidyabaglamukhi