Mahabharata 3.268.2

रावणश्च विधिं चक्रे लङ्कायां शास्त्रनिर्मितम्प्रकृत्यैव दुराधर्षा दृढप्राकारतोरणा

rāvaṇaśca vidhiṃ cakre laṅkāyāṃ śāstranirmitamprakṛtyaiva durādharṣā dṛḍhaprākāratoraṇā

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