Matsya Purana — Tārakāsura’s Austerity and Boon; Mobilization for War; Bṛhaspati’s Fourfold P...
उत्तीर्णं तपसस्तं तु दैत्यं दैत्येश्वरास्तथा परिवव्रुः सहस्राक्षं दिवि देवगणा यथा //
uttīrṇaṃ tapasastaṃ tu daityaṃ daityeśvarāstathā parivavruḥ sahasrākṣaṃ divi devagaṇā yathā //
But when that Daitya had successfully completed his austerities (tapas), the lords of the Daityas surrounded him—just as the hosts of gods in heaven surround Sahasrākṣa (Indra).
This verse does not describe pralaya directly; it highlights a common Purāṇic pattern where intense tapas elevates a being’s power, triggering shifts in cosmic balance that can precede larger upheavals.
By analogy, it underscores that disciplined effort (tapas/vrata-like self-control) brings stature and followers; for a king, this translates into earning loyalty through restraint and merit rather than mere force.
No Vāstu or temple-building rule is stated; the ritual takeaway is the efficacy of tapas as a sanctioned spiritual practice capable of producing worldly and supernatural influence.