In Siddha Yoga, take this mantra with a complete betel nut and retain it in front and chant ten rounds of this mantra. ॥ॐ नमो महाशाबरी शक्ति मम अरिष्टं निवारय मम कार्य सिद्धं कुरु कुरु स्वाहाः॥ I've some serious reference to some really powerful tantrik in Kolkata or black magic https://yogin306rqo1.smblogsites.com/profile