Matsya Purana — The Battle at Tripura: Shiva’s Strategy
स वज्रनिहतो दैत्यो वज्रसंहननोपमः पपात वज्राभिहतः शक्रेणाद्रिरिवाहतः //
sa vajranihato daityo vajrasaṃhananopamaḥ papāta vajrābhihataḥ śakreṇādririvāhataḥ //
Struck down by the thunderbolt, that Daitya—whose frame was as hard as the thunderbolt itself—fell, smitten by Śakra’s vajra, like a mountain shattered by a blow.
This verse is not about Pralaya; it uses epic imagery (a mountain struck) to emphasize the sudden, decisive destruction of a Daitya by Indra’s vajra in a Deva–Daitya conflict.
Indirectly, it reinforces the Puranic ethic that protective power (kṣatra/royal force) must decisively remove violent threats to order—symbolized here by Indra’s vajra—so that dharma and social stability can endure.
No Vastu or ritual procedure is taught here; the only “technical” element is the vajra as a mythic weapon and the simile of a mountain (adri) struck, used for poetic force rather than architectural instruction.