Hanuman assumed Panchamukhi or five-faced sort to kill Ahiravana, a strong rakshasa black-magician and practitioner with the dim arts in the Ramayana war. Ahiravana, brother of Ravana, had taken Lord Rama and Lakshmana to netherworld as captive, and the only technique to kill him was to extinguish 5 lamps burning https://www.facebook.com/share/1J6iVuTuXb/