Matsya Purana — The Slaying of Jambha and the Rise of Tāraka: Divine Battle Formations
ततः प्रतिहतः सो ऽथ दैत्येन्द्रः प्रतिभानवान् वारुणास्त्रं मुमोचाथ शमनं पावकार्चिषाम् //
tataḥ pratihataḥ so 'tha daityendraḥ pratibhānavān vāruṇāstraṃ mumocātha śamanaṃ pāvakārciṣām //
Then, being repelled, that brilliant lord of the Dānavas released the Varuṇa weapon, a countermeasure meant to quell the blazing flames of fire.
It does not describe cosmic pralaya directly; it uses the elemental logic of water countering fire through the Vāruṇāstra, echoing Purāṇic ideas of balancing elemental forces.
Indirectly, it models prudent strategy: when opposed, one should apply an appropriate countermeasure (upāya) rather than brute force—an ethic echoed in Purāṇic counsel on governance and self-control.
No Vāstu or temple rule is stated; the ritual subtext is astravidyā—invoked divine forces where Varuṇa’s watery power is employed to pacify Agni’s flames.