The blessings of Maa Baglamukhi create a divine protecting shield in the shape of an aura about somebody therefore guarding him/her from malefic energies in the shape of black magic spells or evil eye. Lord Vishnu strictly penanced the Goddess and she appeared in the form of Baglamukhi at https://www.youtube.com/watch?v=IOlRdolK0uM&t=2s