Matsya Purana — Inquiry into Yayāti’s Story and the Kacha–Devayānī Episode
सुराणामसुराणां च समजायत वै मिथः ऐश्वर्यं प्रति संघर्षस् त्रैलोक्ये सचराचरे //
surāṇāmasurāṇāṃ ca samajāyata vai mithaḥ aiśvaryaṃ prati saṃgharṣas trailokye sacarācare //
Between the gods and the demons there truly arose a mutual clash—a struggle for dominion—throughout the three worlds, with all that moves and all that is unmoving.
It does not describe Pralaya directly; it portrays a destabilizing cosmic struggle for sovereignty between Devas and Asuras that affects the entire three-world system.
By framing conflict as driven by the pursuit of aiśvarya (dominion), it implicitly warns that rule must be grounded in dharma; unchecked ambition leads to disorder affecting all beings, a key Purāṇic lesson for kingship.
No explicit Vāstu or ritual procedure is stated; the verse functions as cosmological background, often used in Purāṇas to motivate later prescriptions for rites and order-restoring practices.