Matsya Purana — Maya’s Nectar-Reservoir in Tripura and the Revival of the Slain in the Tripur...
अन्वास्यैव च रुद्रस्य भवामः प्रभविष्णवः तैर्वा विनिहता युद्धे भविष्यामो यमाशनाः //
anvāsyaiva ca rudrasya bhavāmaḥ prabhaviṣṇavaḥ tairvā vinihatā yuddhe bhaviṣyāmo yamāśanāḥ //
Attending upon Rudra alone, we shall become mighty and all-prevailing; or else, if we are struck down by them in battle, we shall become food for Yama—that is, we shall meet death.
This verse does not describe pralaya directly; it uses Yama as a symbol of mortality, stressing that defeat in battle leads to death rather than cosmic dissolution.
It highlights a dharmic principle applicable to rulers and householders alike: take refuge in a rightful higher authority (here, Rudra) to gain strength and success; otherwise, reckless conflict without proper support leads to ruin.
No Vāstu or temple-rule detail is stated explicitly; the ritual takeaway is the emphasis on upāsanā/attendance upon Rudra as a means to gain protective power.