The Brahmashira burns the unborn

Ashvatthama launches the Brahmashira weapon. Arjuna answers with his own. The sages beg them to withdraw, because the clash would burn the world. Ashvatthama cannot recall his, so he redirects it into the wombs of the Pandava women; Krishna revives the stillborn Parikshit.

Summary by the editors. Translation: Summary in my own words