Matsya Purana — Kārtavīrya Arjuna’s Solar Boon and the Genealogy from Kroṣṭu to the Yādava Lines
उशना तु सुयज्ञस्य यो रक्षन्पृथिवीमिमाम् आजहाराश्वमेधानां शतमुत्तमधार्मिकः //
uśanā tu suyajñasya yo rakṣanpṛthivīmimām ājahārāśvamedhānāṃ śatamuttamadhārmikaḥ //
But Uśanā, while protecting this earth on behalf of Suyajña, performed a hundred Aśvamedha sacrifices; he was a supremely righteous upholder of dharma.
This verse does not address pralaya directly; it highlights dharmic kingship and sacrificial merit within genealogical narration rather than cosmic dissolution.
It links ideal rulership with two core duties: protecting the realm (“guarding the earth”) and upholding Vedic order through major public rites like the Aśvamedha—portraying sovereignty as service to dharma, not mere power.
The ritual significance is explicit: the Aśvamedha is cited as a peak royal sacrifice, signaling imperial authority and dharmic legitimacy (useful for readers seeking Matsya Purana ritual references rather than Vastu rules).