Matsya Purana — Vishnu’s Battle with the Daityas: Astra-Combat
यावन्न संध्या न दशां प्रयान्ति दैत्येश्वराश्चास्त्रनिवारणाय तावत्क्षणेनैव जघान कोटीर् दैत्येश्वराणां सगजान्सहाश्वान् //
yāvanna saṃdhyā na daśāṃ prayānti daityeśvarāścāstranivāraṇāya tāvatkṣaṇenaiva jaghāna koṭīr daityeśvarāṇāṃ sagajānsahāśvān //
So long as twilight had not yet come, and while the lords of the Daityas were still making ready to ward off the weapons, in that very instant he struck down crores of Daitya kings—together with their elephants and horses.
This verse does not address pralaya or cosmology; it depicts a rapid battlefield slaughter occurring before twilight, emphasizing martial speed and overwhelming force rather than dissolution doctrine.
Indirectly, it reflects the kṣātra (royal/warrior) ideal of decisive action and protection through strength—showing how swiftly a threat may be neutralized before it can organize defenses.
No Vāstu, temple-building, or ritual procedure is mentioned; the only technical term is astra-nivāraṇa (repelling weapons), which belongs to martial vocabulary rather than architecture.