Matsya Purana — Vishnu’s Battle with the Daityas: Astra-Combat
तदस्त्रमुग्रं दृष्ट्वा तु दानवा युद्धदुर्मदाः चक्रुरस्त्राणि दिव्यानि नानारूपाणि संयुगे //
tadastramugraṃ dṛṣṭvā tu dānavā yuddhadurmadāḥ cakrurastrāṇi divyāni nānārūpāṇi saṃyuge //
But when the Dānavas—made reckless by the frenzy of battle—beheld that terrible weapon, they, in the thick of combat, unleashed divine missiles of many different forms.
This verse is not about Pralaya; it depicts a martial escalation where the Dānavas respond to a fierce weapon by deploying multiple divine astras in battle.
Indirectly, it reflects the Purāṇic idea that warfare can intensify through retaliation and counter-weapons—implying that rulers should restrain violent escalation and exercise discernment (nīti) when force is used.
No Vāstu or temple-ritual rule is stated here; the technical focus is on astras (invoked missiles) and the depiction of divine weaponry in a battle context.