Hanuman assumed Panchamukhi or 5-faced form to kill Ahiravana, a powerful rakshasa black-magician and practitioner from the dark arts over the Ramayana war. Ahiravana, brother of Ravana, experienced taken Lord Rama and Lakshmana to netherworld as captive, and the one solution to destroy him was to extinguish 5 lamps burning https://beaurahov.getblogs.net/69248598/what-does-bhairav-mean