Matsya Purana — The Slaying of Jambha and the Rise of Tāraka: Divine Battle Formations
गान्धर्वमस्त्रं संधाय सुरसैन्येषु चापरम् एकैकेन प्रहारेण गजानश्वान्महारथान् //
gāndharvamastraṃ saṃdhāya surasainyeṣu cāparam ekaikena prahāreṇa gajānaśvānmahārathān //
Fixing the Gāndharva Astra upon his weapon—and taking yet another weapon besides—he struck into the host of the gods, and with single, distinct blows felled elephants, horses, and great chariot-warriors.
This verse does not discuss pralaya; it focuses on battlefield action and the use of supernatural astras against the deva-army.
Indirectly, it reflects the Kshatriya ideal of martial prowess and strategic force; however, it is primarily narrative rather than a prescriptive rule for royal or household dharma.
No Vastu/temple-architecture or ritual procedure is specified; the key technical term is the ‘Gāndharva Astra,’ a specialized divine weapon used in combat.