Matsya Purana — Origins of Gods and Beings: Daksha’s Progeny
आपो ध्रुवश्च सोमश्च धरश्चैवानिलो ऽनलः प्रत्यूषश्च प्रभासश्च वसवो ऽष्टौ प्रकीर्तिताः //
āpo dhruvaśca somaśca dharaścaivānilo 'nalaḥ pratyūṣaśca prabhāsaśca vasavo 'ṣṭau prakīrtitāḥ //
Āpa, Dhruva, Soma, Dhara, Anila, Anala, Pratyūṣa, and Prabhāsa—these are proclaimed as the eight Vasus.
It does not describe Pralaya directly; it identifies the Aṣṭa Vasus—cosmic deities linked with elemental forces (water, wind, fire, radiance) that structure and sustain the ordered universe.
Indirectly, it supports dharmic worldview: knowing the deities and cosmic principles is part of traditional learning (śruti-smṛti-purāṇa knowledge) that guides righteous governance and household rituals, though no specific royal or domestic duty is stated here.
No explicit Vāstu or temple rule is given, but the Vasus are commonly invoked as elemental regulators; such deity-lists often underpin ritual invocations and directional/elemental harmonization used in Vedic-Puranic worship frameworks.