Matsya Purana — The Battle at Tripura: Shiva’s Strategy
विशान्तयामास यथा सदैव निशाकरः संचितशार्वरं तमः ततो ऽपकृष्टे च तमःप्रभावे अस्त्रप्रभावे च विवर्धमाने //
viśāntayāmāsa yathā sadaiva niśākaraḥ saṃcitaśārvaraṃ tamaḥ tato 'pakṛṣṭe ca tamaḥprabhāve astraprabhāve ca vivardhamāne //
As the moon ever soothes and dispels the darkness amassed through the night, so too—when the power of darkness was driven back—the radiance and potency of the weapons continually increased.
It does not directly teach Pralaya doctrine; it uses a cosmic image (the moon dispersing night-darkness) as a simile for darkness being repelled and a radiant power rising—symbolically echoing restoration of order rather than dissolution.
Indirectly, it supports a dharmic ethic: when confusion and ‘darkness’ (adharma) are restrained, rightful power and clarity increase—an ideal for kingship (restoring order) and household discipline (removing inner tamas).
No explicit Vāstu or ritual rule appears; the verse is primarily poetic-narrative, using lunar imagery and the technical term astra-prabhāva (weapon potency) rather than temple-building or rite procedures.