Valmiki Ramayana 7.25.36

खरैरुष्ट्रैर्हयैर्दीप्तैः शिंशुमारैर्महोरगैः ।राक्षसाः प्रययुः सर्वे कृत्वा ऽ ऽकाशं निरन्तरम्॥

kharairuṣṭrairhayairdīptaiḥ śiṃśumārairmahoragaiḥ |rākṣasāḥ prayayuḥ sarve kṛtvā ' 'kāśaṃ nirantaram ||

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