Declension table of ?viṣṭatva

Neuter	Singular	Dual	Plural
Nominative	viṣṭatvam	viṣṭatve	viṣṭatvāni
Vocative	viṣṭatva	viṣṭatve	viṣṭatvāni
Accusative	viṣṭatvam	viṣṭatve	viṣṭatvāni
Instrumental	viṣṭatvena	viṣṭatvābhyām	viṣṭatvaiḥ
Dative	viṣṭatvāya	viṣṭatvābhyām	viṣṭatvebhyaḥ
Ablative	viṣṭatvāt	viṣṭatvābhyām	viṣṭatvebhyaḥ
Genitive	viṣṭatvasya	viṣṭatvayoḥ	viṣṭatvānām
Locative	viṣṭatve	viṣṭatvayoḥ	viṣṭatveṣu

Compound viṣṭatva -

Adverb -viṣṭatvam -viṣṭatvāt