Matsya Purana — The Battle at Tripura: Shiva’s Strategy
चन्द्रोदयात्समुद्भूतः पौर्णमास इवार्णवः त्रिपुरं प्रभवत् तद्वद् भीमरूपमहासुरैः //
candrodayātsamudbhūtaḥ paurṇamāsa ivārṇavaḥ tripuraṃ prabhavat tadvad bhīmarūpamahāsuraiḥ //
As the ocean swells up at the rising of the moon on the full-moon night, so too did Tripura come into mighty being—brought forth by the great asuras of dreadful form.
It does not describe Pralaya directly; it uses a cosmic image (the ocean swelling at full moon) to convey sudden expansion and formidable emergence—here, the rise of Tripura through asuric power.
Indirectly, it warns that power can rapidly consolidate when driven by fearsome forces; a king is implied to remain vigilant, uphold dharma, and prevent destructive concentrations of power that threaten social order.
Tripura literally evokes “three cities/fortresses,” hinting at grand constructed strongholds; the verse itself is not a Vāstu rule, but it frames Tripura as an engineered, formidable urban/fortress reality that later narratives treat as requiring divine counter-measure.