Declension table of ?mantravat

Masculine	Singular	Dual	Plural
Nominative	mantravān	mantravantau	mantravantaḥ
Vocative	mantravan	mantravantau	mantravantaḥ
Accusative	mantravantam	mantravantau	mantravataḥ
Instrumental	mantravatā	mantravadbhyām	mantravadbhiḥ
Dative	mantravate	mantravadbhyām	mantravadbhyaḥ
Ablative	mantravataḥ	mantravadbhyām	mantravadbhyaḥ
Genitive	mantravataḥ	mantravatoḥ	mantravatām
Locative	mantravati	mantravatoḥ	mantravatsu

Compound mantravat -

Adverb -mantravantam