Declension table of ?viṣṇumantra

Masculine	Singular	Dual	Plural
Nominative	viṣṇumantraḥ	viṣṇumantrau	viṣṇumantrāḥ
Vocative	viṣṇumantra	viṣṇumantrau	viṣṇumantrāḥ
Accusative	viṣṇumantram	viṣṇumantrau	viṣṇumantrān
Instrumental	viṣṇumantreṇa	viṣṇumantrābhyām	viṣṇumantraiḥ viṣṇumantrebhiḥ
Dative	viṣṇumantrāya	viṣṇumantrābhyām	viṣṇumantrebhyaḥ
Ablative	viṣṇumantrāt	viṣṇumantrābhyām	viṣṇumantrebhyaḥ
Genitive	viṣṇumantrasya	viṣṇumantrayoḥ	viṣṇumantrāṇām
Locative	viṣṇumantre	viṣṇumantrayoḥ	viṣṇumantreṣu

Compound viṣṇumantra -

Adverb -viṣṇumantram -viṣṇumantrāt