Matsya Purana — The Terror of Tripura and the Gods’ Hymn to Śiva
तच्च तेषामधिष्ठानं त्रिपुरं त्रिदशर्षभाः एकेषुपातमोक्षेण हन्तव्यं नेषुवृष्टिभिः //
tacca teṣāmadhiṣṭhānaṃ tripuraṃ tridaśarṣabhāḥ ekeṣupātamokṣeṇa hantavyaṃ neṣuvṛṣṭibhiḥ //
And that stronghold of theirs—Tripura—O best of the gods, must be destroyed by the discharge of a single arrow, not by showers of arrows.
It does not describe cosmic Pralaya directly; it emphasizes a decisive, divinely sanctioned destruction—Tripura is to fall through one ordained strike rather than prolonged violence.
It implies the dharmic ideal of precise, proportionate action: victory (or problem-solving) should be achieved through a single well-judged measure when possible, not through excessive force or repeated harm.
Tripura is framed as an adhiṣṭhāna (fortified seat/stronghold); the verse highlights the concept of a seemingly impregnable fortified structure being overcome only by a ritually/strategically ‘perfect’ single act—useful for interpreting Puranic fort-city symbolism rather than giving direct Vastu rules.