Matsya Purana — The Battle for Tripura: Portents
येन येन ततो विद्युन् माली याति मयश्च सः तेन तेन पुरं शून्यं प्रमथैः प्रहृतैः कृतम् //
yena yena tato vidyun mālī yāti mayaśca saḥ tena tena puraṃ śūnyaṃ pramathaiḥ prahṛtaiḥ kṛtam //
Wherever Vidyunmālī went, with Maya beside him, in that very direction the city was left deserted, smitten by the Pramathas.
It depicts localized devastation—an emptied city due to divine-attendant forces—rather than cosmic Pralaya; the emphasis is on sudden desolation produced by violent assault.
By portraying a city rendered empty through attack, it implicitly highlights the royal duty of protection (rakṣaṇa) and preparedness; for householders it underscores the fragility of worldly security and the need for dharmic resilience.
Architecturally, it uses the key urban motif of a 'pura' becoming 'śūnya' (abandoned), a negative counterpart to Vāstu ideals—showing how even well-built settlements can be nullified when protective and ritual order collapses under assault.