Matsya Purana — Narasimha’s Victory over Hiraṇyakaśipu and the Catalogue of Apocalyptic Omens
देवानामपि यो देवः सो ऽप्यवर्षत शोणितम् अपतन्गगनादुल्का विद्युद्रूपा महास्वनाः //
devānāmapi yo devaḥ so 'pyavarṣata śoṇitam apatangaganādulkā vidyudrūpā mahāsvanāḥ //
Even that god who is the God of the gods rained down blood; and from the sky fell blazing meteors, lightning-shaped and thunderous.
It lists classic pralaya-nimittas (omens of dissolution): blood-like rain and sky-falling meteors with thunderous sound, signaling a breakdown of cosmic order.
Such omens function as warnings: a king should intensify protection, charity, and public rites for appeasement, while householders should strengthen dharma—truthfulness, restraint, and prescribed offerings—when disorder appears.
Ritually, these are adbhuta signs that prompt śānti-karmas (pacificatory rites) and protective homas; architecturally, it implies safeguarding settlements/temples through consecrated boundaries and corrective rites rather than design rules in this specific verse.