Matsya Purana — Design and Splendour of Tripura: Maya’s Threefold Moving Fortress
तदासुरैर्दर्पितवैरिमर्दनैर् जनार्दनैः शैलकरीन्द्रसंनिभैः बभूव पूर्णं त्रिपुरं तथा पुरा यथाम्बरं भूरिजलैर् जलप्रदैः //
tadāsurairdarpitavairimardanair janārdanaiḥ śailakarīndrasaṃnibhaiḥ babhūva pūrṇaṃ tripuraṃ tathā purā yathāmbaraṃ bhūrijalair jalapradaiḥ //
Then Tripura became completely filled, as in former times—by those proud Asuras, crushers of their foes, mighty as mountains and like lordly elephants—just as the sky is filled by rain-bearing clouds laden with abundant waters.
It does not describe Pralaya directly; it uses a cosmological image—sky filled by rain clouds—to poetically convey how Tripura became densely occupied by powerful Asuras.
Indirectly, it warns against darpa (arrogance) and hostile conquest; the Purana’s ethical frame treats pride-driven aggression as a cause of downfall, contrasting with righteous kingship grounded in dharma.
Architecturally, it highlights Tripura as a fortified ‘city/stronghold’ concept (tripura) being ‘filled’ with forces—useful for understanding Puranic imagery of fortified settlements, though no specific Vastu rule is stated in this verse.