Mahabharata 1.215.17

तथा कृष्णस्य वीर्येण नायुधं विद्यते समम्येन नागान्पिशाचांश्च निहन्यान्माधवो रणे

tathā kṛṣṇasya vīryeṇa nāyudhaṃ vidyate samamyena nāgānpiśācāṃśca nihanyānmādhavo raṇe

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