Hanuman assumed Panchamukhi or 5-faced sort to kill Ahiravana, a strong rakshasa black-magician and practitioner of the dim arts throughout the Ramayana war. Ahiravana, brother of Ravana, had taken Lord Rama and Lakshmana to netherworld as captive, and the only real approach to destroy him was to extinguish five lamps https://www.youtube.com/@Mahavidyabaglamukhi