Matsya Purana — The Battle for Tripura: Portents
मृधं यथासुराणां च प्रमथानां प्रवर्तते अम्बरे ऽम्भसि च तथा युद्धं चक्रुर्जलेचराः //
mṛdhaṃ yathāsurāṇāṃ ca pramathānāṃ pravartate ambare 'mbhasi ca tathā yuddhaṃ cakrurjalecarāḥ //
Just as a pitched battle breaks out between the Asuras and the Pramathas, so too the water-dwelling beings waged war—both in the sky and in the waters.
It does not directly describe Pralaya; it depicts a large-scale, cosmic-style conflict extending across sky and waters, a common Purāṇic motif that can accompany upheavals but is not itself dissolution here.
Indirectly, it frames war as an organized, consequential act with multiple arenas; in Purāṇic ethics this supports the idea that rulers must understand the scope and cost of conflict and restrain violence to what is necessary and dharmic.
No Vāstu or ritual procedure is specified in this verse; it is primarily narrative, emphasizing the battlefield’s vastness (sky and sea) rather than temple-building or rites.