Matsya Purana — Characteristics of Dvāpara and Kali Yugas
एषा कलियुगावस्था संध्यांशौ तु निबोधत युगे युगे तु हीयन्ते त्रींस्त्रीन्पादांश्च सिद्धयः //
eṣā kaliyugāvasthā saṃdhyāṃśau tu nibodhata yuge yuge tu hīyante trīṃstrīnpādāṃśca siddhayaḥ //
Know this as the condition of the Kali Yuga, especially in its twilight junction (sandhyā): in each succeeding yuga, the spiritual attainments (siddhis) diminish, losing in turn three and three ‘quarters’ (parts/steps).
It does not describe Pralaya directly; it describes cyclical time (yugas) and emphasizes degeneration in spiritual capacities (siddhis) as ages progress, a backdrop often used in Purāṇas to frame why dharma and realization become harder in Kali Yuga.
By stating that siddhis and higher capacities decline with time, it implies that rulers and householders must rely more on disciplined dharma—law, charity, restraint, and ritual order—rather than expecting extraordinary spiritual powers to uphold society in Kali Yuga.
No explicit Vāstu or temple-rule detail appears here; the ritual takeaway is broader—Kali Yuga is a junctional, weakened era, so spiritual results are reduced and practice must be steadier and more rule-based to compensate for diminished siddhis.