Hanuman assumed Panchamukhi or 5-confronted type to destroy Ahiravana, a powerful rakshasa black-magician and practitioner on the dim arts over the Ramayana war. Ahiravana, brother of Ravana, had taken Lord Rama and Lakshmana to netherworld as captive, and the one way to destroy him was to extinguish 5 lamps burning https://www.facebook.com/share/1J6iVuTuXb/