Matsya Purana — Inquiry into Taraka’s Slaying and the Prelude to Guha
तावच्चावाङ्मुखः कालं तावत्पञ्चाग्निमध्यगः निराहारो घोरतपास् तपोराशिरजायत //
tāvaccāvāṅmukhaḥ kālaṃ tāvatpañcāgnimadhyagaḥ nirāhāro ghoratapās taporāśirajāyata //
For that very span of time he remained with his face turned downward; for that same span he stayed amid the five fires. Fasting from food and practicing dreadful austerity, he became a veritable mass of ascetic power.
It does not describe Pralaya directly; it highlights how immense tapas is generated through extreme disciplines—power often portrayed in the Purāṇas as capable of influencing cosmic events, boons, and protection across ages.
It contrasts royal/householder dharma with renunciant intensity: while kings and householders typically follow regulated vows, charity, and sacrifice, this verse exemplifies the ascetic ideal of self-control (fasting, endurance) as another sanctioned path within Purāṇic dharma.
The ritual element is pañcāgni-tapas—an austere observance involving exposure to five fires (four around and the sun overhead), emphasizing ritual heat as a purifier and a generator of spiritual potency rather than a Vāstu/temple-building rule.