Matsya Purana — The Battle at Tripura: Shiva’s Strategy
चन्द्रोदयात्समुद्भूतः पौर्णमास इवार्णवः त्रिपुरं प्रभवत्तद्वद् भीमरूपमहासुरैः //
candrodayātsamudbhūtaḥ paurṇamāsa ivārṇavaḥ tripuraṃ prabhavattadvad bhīmarūpamahāsuraiḥ //
As the ocean seems to swell with the rising of the moon on the night of the full moon, so too did Tripura come into being—brought forth by mighty great Asuras of dreadful form.
It does not describe Pralaya directly; it uses a cosmic-natural image (moonrise swelling the ocean) to portray the sudden arising of Tripura, emphasizing emergence and expansion rather than dissolution.
Indirectly, it frames a threat (the rise of formidable Asuras and their stronghold) that, in Purāṇic ethics, calls for kṣatra-dharma—protecting society from oppressive powers and restoring order.
The verse names Tripura (a ‘triple city/fortress’), hinting at fortified construction and formidable built forms, but it gives no explicit Vāstu rules or ritual procedure in this line.