Matsya Purana — Genealogy of Kaśyapa: Ādityas
शेषवासुकिकर्कोटशङ्खैरावतकम्बलाः धनंजयमहानीलपद्माश्वतरतक्षकाः //
śeṣavāsukikarkoṭaśaṅkhairāvatakambalāḥ dhanaṃjayamahānīlapadmāśvataratakṣakāḥ //
Śeṣa, Vāsuki, Karkoṭa, Śaṅkha, Airāvata, and Kambala; likewise Dhanaṃjaya, Mahānīla, Padma, Aśvatara, and Takṣaka—these are the eminent Nāgas (serpent-lords).
This verse does not directly describe Pralaya; it supports the Purana’s broader cosmological map by listing major Nāgas, beings often associated with the subterranean realms and cosmic stability (especially Śeṣa).
Indirectly, it functions as sacred cosmological knowledge (itihāsa–purāṇa learning) that a king or householder is encouraged to hear and preserve; it does not prescribe a specific ethical duty in this line itself.
No explicit Vāstu or ritual rule is stated; however, Nāga names are commonly invoked in protective rites and temple/house threshold traditions, so the list can serve as a referential catalogue for later ritual usage.