Matsya Purana — Genealogy from Budha to Purūravas and Yayāti; Raji’s war episode; the Paurava...
पञ्चपञ्चाशदब्दानि लता सूक्ष्मा भविष्यसि पुरूरवाः पिशाचत्वं तत्रैवानुभविष्यति //
pañcapañcāśadabdāni latā sūkṣmā bhaviṣyasi purūravāḥ piśācatvaṃ tatraivānubhaviṣyati //
“For fifty-five years you shall become a subtle creeper (a delicate vine). And Purūravas shall, in that very place, undergo the state of a piśāca (a goblin-like being).”
This verse does not describe Pralaya; it presents a curse-like transformation and its consequence, emphasizing karmic result and altered states of being rather than cosmic dissolution.
Indirectly, it underlines the Purāṇic ethic that actions and breaches of conduct can lead to severe consequences (loss of status, suffering, social/ritual exclusion), a caution relevant to rulers and householders who must uphold dharma.
No Vāstu, temple-building, or ritual procedure is specified in this verse; its focus is narrative—metamorphosis into a vine and Purūravas experiencing piśāca-hood at that location.