Mahabharata 7.101.12

ततो द्रोणो महाराज केकयं वै विशेषयन्प्रादुश्चक्रे रणे दिव्यं ब्राह्ममस्त्रं महातपाः

tato droṇo mahārāja kekayaṃ vai viśeṣayanprāduścakre raṇe divyaṃ brāhmamastraṃ mahātapāḥ

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