Shiva Purana

siva.sh/siva-purana/saturda-samhita/24/29

वंशोद्भवं वज्रं शरो ब्रह्मशिरस्तथा।। अन्यास्थिभिर्बहूनि स्वपराण्यस्त्राणि निर्ममे ।। २९।।

sanskrit

With his backbone he made the thunderbolt, arrow and the missile called Brahmaśiras. With the other bones he made many other weapons.

english translation

vaMzodbhavaM vajraM zaro brahmazirastathA|| anyAsthibhirbahUni svaparANyastrANi nirmame || 29||

hk transliteration by Sanscript