Matsya Purana — The Battle for Tripura: Portents
प्रययुस्तत्पुरं हन्तुं शरीरमिव व्याधयः शङ्खाडम्बरनिर्घोषैः पणवान्पटहानपि नादयन्तः पुरो देवा दृष्टास्त्रिपुरवासिभिः //
prayayustatpuraṃ hantuṃ śarīramiva vyādhayaḥ śaṅkhāḍambaranirghoṣaiḥ paṇavānpaṭahānapi nādayantaḥ puro devā dṛṣṭāstripuravāsibhiḥ //
The gods advanced to destroy that city, like diseases assailing a body; and with the thunderous blare of conches and loud instruments—sounding drums and kettledrums—they were seen in the vanguard by the inhabitants of Tripura.
It does not describe cosmic pralaya; it uses a simile—diseases attacking a body—to depict the gods’ assault on Tripura as an inevitable, overwhelming force.
Indirectly, it models strategic readiness and public signaling: the coordinated advance with conches and drums reflects organized leadership and morale—ideas echoed in Purāṇic guidance on royal discipline and protection of society.
No Vāstu rule is taught here, but the ritual-martial soundscape (conches, drums) reflects standard auspicious battlefield/ceremonial practice used to announce a major public action and intimidate opponents.