Matsya Purana — War of Devas and Asuras; Birth of Aurva Fire; Countering Tamasī Māyā through ...
वपुर्दीप्तान्तरात्मानम् एतत्कृत्वा मनोमयम् दारयोगं विना स्रक्ष्ये पुत्रम् आत्मतनूरुहम् //
vapurdīptāntarātmānam etatkṛtvā manomayam dārayogaṃ vinā srakṣye putram ātmatanūruham //
Having fashioned this radiant-bodied being—whose inner self shines—by the power of the mind alone, I shall, without union with a wife, bring forth a son, a sprout of my own body.
It does not describe Pralaya directly; instead, it presents a Puranic mode of creation—mental or will-born generation (manomaya), showing that lineage can continue through ascetic/psychic creation rather than physical procreation.
In dynasty-focused passages, producing an heir is tied to social continuity (vamsha-pravṛtti). This verse highlights an exceptional, non-householder route—creating progeny without marital union—often reserved for sages or extraordinary rulers in Puranic accounts.
No Vastu Shastra or temple-architecture rule is stated here; the technical emphasis is on manomaya creation and self-born progeny, not on building rites or iconographic measurements.