Matsya Purana — Dhruva as Cosmic Pivot: Motions of Sun–Moon–Planets
नानारूपधराश्चैव महाघोरस्वराश्च ते कल्पान्तवृष्टिकर्तारः कल्पान्ताग्नेर् नियामकाः //
nānārūpadharāścaiva mahāghorasvarāśca te kalpāntavṛṣṭikartāraḥ kalpāntāgner niyāmakāḥ //
Assuming many forms and uttering exceedingly dreadful sounds, they become the makers of the end-of-aeon rains and the regulators of the end-of-aeon fire.
It portrays Pralaya as an ordered cosmic process: specific agents manifest in many forms, unleash the catastrophic end-time rains, and also regulate the equally destructive kalpānta fire—showing dissolution is governed, not random.
Indirectly, it reinforces the Purāṇic ethic that even vast destruction operates under niyama (cosmic regulation). By analogy, kings and householders should govern passions and power through discipline and lawful order, not impulse.
No direct Vāstu or ritual procedure is stated; the takeaway is theological-cosmological: rituals and sacred architecture in the Purāṇic worldview are grounded in a cosmos where even pralaya forces act under regulation.