Declension table of ?viṣṇutantra

Neuter	Singular	Dual	Plural
Nominative	viṣṇutantram	viṣṇutantre	viṣṇutantrāṇi
Vocative	viṣṇutantra	viṣṇutantre	viṣṇutantrāṇi
Accusative	viṣṇutantram	viṣṇutantre	viṣṇutantrāṇi
Instrumental	viṣṇutantreṇa	viṣṇutantrābhyām	viṣṇutantraiḥ
Dative	viṣṇutantrāya	viṣṇutantrābhyām	viṣṇutantrebhyaḥ
Ablative	viṣṇutantrāt	viṣṇutantrābhyām	viṣṇutantrebhyaḥ
Genitive	viṣṇutantrasya	viṣṇutantrayoḥ	viṣṇutantrāṇām
Locative	viṣṇutantre	viṣṇutantrayoḥ	viṣṇutantreṣu

Compound viṣṇutantra -

Adverb -viṣṇutantram -viṣṇutantrāt