Matsya Purana — War of Devas and Asuras; Birth of Aurva Fire; Countering Tamasī Māyā through ...
तद्घनीभूतदैत्येन्द्रम् अन्धकार इवार्णवे दानवं देवकदनं तमोभूतमिवाभवत् //
tadghanībhūtadaityendram andhakāra ivārṇave dānavaṃ devakadanaṃ tamobhūtamivābhavat //
That Danava—an afflicter of the gods—became like darkness upon the ocean: the Daitya-lord, densely massed, appeared as though transformed into sheer gloom.
It uses pralaya-like imagery—darkness covering the ocean—to convey overwhelming tamas, but it is primarily a battle/narrative simile rather than a technical account of cosmic dissolution.
Indirectly, it frames adharma as ‘darkness’ that overwhelms order; the implied ethical lesson aligns with the Purāṇic ideal that rulers and householders should uphold dharma to prevent society from falling into tamas-like confusion.
No direct Vāstu or ritual rule is stated; the verse is descriptive, employing ocean-and-darkness imagery rather than prescribing temple architecture or rites.