Valmiki Ramayana 6.18.14

महोदरमहापार्स्वौ राक्षसश्चाप्यकम्पनः ।अवीकपास्तु तप्यैते लोकपालसमा युधि॥

mahodaramahāpārsvau rākṣasaścāpyakampanaḥ |avīkapāstu tapyaite lokapālasamā yudhi ||

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