Matsya Purana — Characteristics of Dvāpara and Kali Yugas
ततस्तेषु प्रनष्टेषु संध्यांशे कूरकर्मसु उत्साद्य पार्थिवान्सर्वांस् तेष्वतीतेषु वै तदा //
tatasteṣu pranaṣṭeṣu saṃdhyāṃśe kūrakarmasu utsādya pārthivānsarvāṃs teṣvatīteṣu vai tadā //
Then, when those (times and observances) had perished—when the twilight-junction of the age had set in and base deeds prevailed—he brought about the destruction of all earthly kings; and when they had passed away, then the next phase unfolded.
It frames dissolution as beginning with a yuga-junction (saṃdhyā) where order collapses and destructive forces remove unrighteous rulers, marking the onset of a larger cycle-change.
By highlighting the ruin of “pārthivas” during moral twilight, it implies that kings who tolerate or embody kūra-karmas lose legitimacy and stability; dharma-protection is presented as the condition for enduring rule.
No direct vastu/ritual rule is stated; the verse instead provides the cosmic-ethical backdrop (yuga-sandhi and decline) often used in the Purana to contextualize why correct rites and dharmic governance become endangered.