Matsya Purana — Manvantaras
तथैवायुः परिक्रान्तं युगधर्मेषु सर्वशः अस्थितिं च कलौ दृष्ट्वा भूतानामायुषश्च वै //
tathaivāyuḥ parikrāntaṃ yugadharmeṣu sarvaśaḥ asthitiṃ ca kalau dṛṣṭvā bhūtānāmāyuṣaśca vai //
So too, the span of life has shifted in every way according to the dharma of each age; and seeing the instability in the Kali age, one understands indeed the diminished lifespan of living beings.
It does not describe pralaya directly; it emphasizes cyclical time by showing that lifespan and stability vary with yuga-dharma, especially becoming unstable in Kali Yuga.
By highlighting Kali-Yuga instability and reduced longevity, it implicitly urges kings and householders to prioritize practical dharma—ethical conduct, restraint, and timely performance of duties—since conditions are less steady and life is shorter.
No explicit Vastu/temple-building or ritual procedure is stated; the takeaway is contextual—Kali-Yuga instability encourages simpler, timely, and feasible ritual observances rather than overly elaborate undertakings.