Matsya Purana — The Slaying of Tāraka: Skanda’s Śakti and the Victory of the Devas
गदां मुमोच दैत्याय षण्मुखः परमस्वनाम् तया हतस्ततो दैत्यश् चकम्पे ऽचलराडिव //
gadāṃ mumoca daityāya ṣaṇmukhaḥ paramasvanām tayā hatastato daityaś cakampe 'calarāḍiva //
Ṣaṇmukha (Skanda) hurled at the Daitya a mace that roared with an overwhelming sound; struck by it, the demon reeled and trembled like the king of mountains.
This verse is not about Pralaya; it is a battlefield image highlighting divine power—Skanda’s weapon-strike makes the demon quake like a mountain.
Indirectly, it models the ideal of protecting order (dharma) by restraining destructive forces; the Purana often uses such combat imagery to underscore the necessity of courage and disciplined force when righteousness is threatened.
No Vāstu or ritual procedure is specified here; the key takeaway is the Purāṇic poetic convention of comparing impact and stability to a mountain (acala), a metaphor sometimes echoed in temple-stotra imagery but not a technical rule in this verse.