Matsya Purana — Saubhagya-Śayana Vow: Lalitā/Gaurī–Śiva Worship
रसराजं च लवणं कुस्तुम्बुरु तथाष्टकम् दत्तं सौभाग्यमित्यस्मात् सौभाग्याष्टकमित्यतः //
rasarājaṃ ca lavaṇaṃ kustumburu tathāṣṭakam dattaṃ saubhāgyamityasmāt saubhāgyāṣṭakamityataḥ //
Because eight items—such as rasarāja, salt, and kustumburu (coriander), among others—are given for the attainment of good fortune, it is therefore called the Saubhāgya-aṣṭaka, the “Eightfold Gift of Auspicious Fortune”.
This verse does not discuss Pralaya; it defines a prosperity-oriented rite (Saubhāgya-aṣṭaka) based on the offering of eight auspicious items.
It supports householder-dharma through dāna (charitable giving): offering prescribed everyday auspicious substances is presented as a meritorious means to cultivate saubhāgya (well-being and marital/household prosperity).
The significance is ritual, not architectural: the verse explains the naming of a specific eight-item offering/observance (aṣṭaka) intended to generate auspicious fortune.