Valmiki Ramayana 6.59.84

आग्नेयेनाथ संयुक्तं गृहीत्वा रावणः शरम् ।ध्वजशीर्षस्थितं नीलमुदैक्षत निशाचरः ।ततो ऽब्रवीन्महातेजा रावणो राक्षसेश्वरः॥

āgneyenātha saṃyuktaṃ gṛhītvā rāvaṇaḥ śaram |dhvajaśīrṣasthitaṃ nīlamudaikṣata niśācaraḥ |tato 'bravīnmahātejā rāvaṇo rākṣaseśvaraḥ ||

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