Matsya Purana — The Battle for Tripura: Portents
पूर्वं महाम्भोधरपर्वताभं द्वारं महान्तं त्रिपुरस्य शक्रः निपीड्य तस्थौ महता बलेन युक्तो ऽमराणां महता बलेन //
pūrvaṃ mahāmbhodharaparvatābhaṃ dvāraṃ mahāntaṃ tripurasya śakraḥ nipīḍya tasthau mahatā balena yukto 'marāṇāṃ mahatā balena //
Then Śakra (Indra), first, pressed hard upon the great eastern gate of Tripura—vast as a mountain laden with rain-clouds—and stood firm there, endowed with mighty strength, supported by the immense power of the gods.
This verse does not discuss Pralaya; it depicts a battle scene where Indra forcefully attacks Tripura’s eastern gate, emphasizing divine power rather than cosmic dissolution.
Indirectly, it models steadfastness and strategic positioning under collective support—qualities praised in Purāṇic ethics for rulers and leaders, though the verse itself is a martial description, not a dharma injunction.
Architecturally, it highlights a monumental fortified gateway (dvāra) of Tripura, described with mountain-like grandeur—useful for interpreting Purāṇic imagery of city defenses, though it is not a Vāstu-śāstra rule.