Matsya Purana — Narasimha’s Victory over Hiraṇyakaśipu and the Catalogue of Apocalyptic Omens
तस्यां प्रतिहतायां तु मायायां युधि दानवः असृजद्घोरसंकाशं तमस्तीव्रं समन्ततः //
tasyāṃ pratihatāyāṃ tu māyāyāṃ yudhi dānavaḥ asṛjadghorasaṃkāśaṃ tamastīvraṃ samantataḥ //
But when that illusion was checked in battle, the Dānava unleashed all around a fierce-looking, intensely thick darkness.
It does not describe Pralaya directly; it portrays a tactical, māyā-born “tamas” (darkness) projected in battle—an image often used in Purāṇas to symbolize obscuration rather than cosmic dissolution.
Ethically, it highlights a core dharma theme: when confronted by deception and confusion (māyā/tamas), one must restore discernment and steadiness—qualities expected of a ruler and a disciplined householder in Purāṇic guidance.
No Vāstu or ritual procedure is stated in this verse; the key takeaway is symbolic—“darkness on all sides” as an obstruction to right perception, contrasted elsewhere with lamp/light rites and clarity-oriented ritual symbolism.