राघवौ Raghavas, वारुणम् Varuna weapons, आग्नेयम् fire weapons, ऐन्द्रम् Indra's, वायव्यमेवच and even wind god's, ब्रह्मशिरःअस्त्रंच even Brahma's, प्रत्यपद्यतांननु why have they not used

"Raghavas knew to use Varuna's weapons, fire god's weapons, Indra's also, even wind god's and Brahma's weapons. Why have they not used?"