Valmiki Ramayana Yuddha Kanda Sarga 21 Shloka 30

दीप्तास्याः those blazing, दीप्तलोचनाः ones with glowing eyes, पन्नगाः snakes, पाताळतलवासिनः those who reside in underworld, महावीर्याः highly valiant ones, दानवाश्च and the demons, व्यथित्याः oppressed आसन् became.

Those snakes with blazing hoods and glowing eyes residing in the underworld and the demons became oppressed.