Matsya Purana — Origin of Soma
वेतालयक्षोरगकिंनराणां पद्मेन चैकेन तथार्बुदेन लक्षैस् त्रिभिर् द्वादशभी रथानां सोमो ऽप्यगात्तत्र विवृद्धमन्युः //
vetālayakṣoragakiṃnarāṇāṃ padmena caikena tathārbudena lakṣais tribhir dvādaśabhī rathānāṃ somo 'pyagāttatra vivṛddhamanyuḥ //
With one padma and one arbuda of Vetālas, Yakṣas, Nāgas, and Kiṃnaras—and with three lakṣas and twelve ratha-units besides—Soma too went there, his wrath greatly inflamed.
This verse does not discuss Pralaya; it depicts a dynastic-war narrative where Soma advances with vast, semi-divine forces, emphasizing scale and divine involvement rather than cosmic dissolution.
Indirectly, it reflects the Purāṇic idea that rulers marshal organized forces (ratha-units and allied hosts) and that anger (manyu) can drive political conflict—serving as a caution that royal action should be governed by dharma rather than inflamed wrath.
No Vāstu or ritual procedure is specified here; the technical interest is numerical/military cataloging (padma, arbuda, lakṣa, ratha) used to convey the magnitude of an army.