Matsya Purana — War of Devas and Dānavas: Yama and Kubera Defeated; Kālanemi’s Māyā and the A...
प्रथमं कार्मुकात्तस्य निश्चेरुर्धूमराजयः अनन्तरं स्फुलिङ्गानां कोटयो दीप्तवर्चसाम् //
prathamaṃ kārmukāttasya niścerurdhūmarājayaḥ anantaraṃ sphuliṅgānāṃ koṭayo dīptavarcasām //
First, from that bow there issued streams of smoke; thereafter, crores of sparks, blazing with radiant brilliance, burst forth.
It depicts a classic pralaya-style portent: a supernatural weapon emitting smoke and innumerable fiery sparks, signaling destabilization and the onset of destructive, purifying fire-energy associated with cosmic upheaval.
Indirectly, it functions as a warning motif: when extraordinary omens arise, the righteous response is restraint, protection of dependents, and adherence to dharma—seeking wise counsel and performing prescribed rites rather than acting from fear or aggression.
While not giving a Vāstu rule directly, the imagery aligns with ritual logic: smoke and sparks evoke homa/agni symbolism—purification and crisis-rites—often recommended in Purāṇic contexts when ominous signs appear.