Matsya Purana — The Slaying of Jambha and the Rise of Tāraka: Divine Battle Formations
अथास्त्रं मौसलं नाम मुमोच दितिनन्दनः ततो ऽयोमुसलैः सर्वम् अभवत्पूरितं जगत् //
athāstraṃ mausalaṃ nāma mumoca ditinandanaḥ tato 'yomusalaiḥ sarvam abhavatpūritaṃ jagat //
Then Diti’s son released the weapon known as the Mausala Astra; thereupon the entire world became filled on all sides with iron clubs.
It does not describe Pralaya itself, but it uses cosmic-scale imagery—“the world filled”—to convey how astra-power can mimic world-ending devastation in battle narratives.
Indirectly, it underscores the danger of uncontrolled violence and the need for restraint and dharmic judgment in the use of force—an ethical backdrop often emphasized in Purāṇic kingship ideals.
No Vāstu or ritual procedure is stated; the verse is focused on martial mythology, specifically the technical notion of an ‘astra’ whose manifested form is an all-pervading shower of iron clubs.