Valmiki Ramayana 7.85.14

कालाग्निनेव घोरेण तप्तेनैव महार्चिषा ।पतता वृत्रशिरसा जगत्ऺत्रासमुपागमत्॥

kālāgnineva ghoreṇa taptenaiva mahārciṣā |patatā vṛtraśirasā jagatऺtrāsamupāgamat ||

Our plain-language meaning of this verse is waiting for scholar review.