Mahabharata 10.12.4

यत्तदाचष्ट पुत्राय द्रोणः परपुरंजयःअस्त्रं ब्रह्मशिरो नाम दहेद्यत्पृथिवीमपि

yattadācaṣṭa putrāya droṇaḥ parapuraṃjayaḥastraṃ brahmaśiro nāma dahedyatpṛthivīmapi

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