Matsya Purana — Uma’s Austerities and the Slaying of the Deceiver Asura ĀḌi
कृत्वोमारूपसंस्थानं गतो दैत्यो हरान्तिकम् पापो रम्याकृतिश्चित्रभूषणाम्बरभूषितः //
kṛtvomārūpasaṃsthānaṃ gato daityo harāntikam pāpo ramyākṛtiścitrabhūṣaṇāmbarabhūṣitaḥ //
Assuming the guise and appearance of Umā, the sinful demon went into the presence of Hara (Śiva)—his form alluring, adorned with splendid garments and variegated ornaments.
This verse does not discuss pralaya; it depicts a narrative moment of deception, where a demon adopts Umā’s appearance to approach Śiva.
Indirectly, it underscores a common Purāṇic ethical theme: external appearance can conceal harmful intent, so discernment (viveka) and vigilance are essential virtues for rulers and householders alike.
No Vāstu or ritual procedure is specified; the verse emphasizes iconographic/visual elements—guise, ornaments, and garments—used to create a convincing divine appearance.