Matsya Purana — The Array of the Gods: Description of the Vaiṣṇava Host and the Lokapālas
केतुना नागराजेन राजमानो यथा रविः युक्तो हयसहस्रेण मनोमारुतरंहसा //
ketunā nāgarājena rājamāno yathā raviḥ yukto hayasahasreṇa manomārutaraṃhasā //
Shining with the serpent-king Ketu like the Sun himself, he was harnessed to a thousand horses, swift as the mind and the wind in his course.
This verse does not discuss pralaya directly; it uses cosmic imagery (Sun-like brilliance and wind-like speed) to magnify a figure’s power in a genealogical/heroic narrative.
Indirectly, it presents the ideal of royal tejas (splendour) and capability—suggesting that a king’s legitimacy is expressed through radiant authority and decisive, swift action.
No explicit Vāstu or ritual rule appears here; however, the Sun-like radiance and banner/ensign motif is often used in temple and royal iconography to signify sovereignty and auspicious power.