Declension table of mahāmantrin

Masculine	Singular	Dual	Plural
Nominative	mahāmantrī	mahāmantriṇau	mahāmantriṇaḥ
Vocative	mahāmantrin	mahāmantriṇau	mahāmantriṇaḥ
Accusative	mahāmantriṇam	mahāmantriṇau	mahāmantriṇaḥ
Instrumental	mahāmantriṇā	mahāmantribhyām	mahāmantribhiḥ
Dative	mahāmantriṇe	mahāmantribhyām	mahāmantribhyaḥ
Ablative	mahāmantriṇaḥ	mahāmantribhyām	mahāmantribhyaḥ
Genitive	mahāmantriṇaḥ	mahāmantriṇoḥ	mahāmantriṇām
Locative	mahāmantriṇi	mahāmantriṇoḥ	mahāmantriṣu

Compound mahāmantri -

Adverb -mahāmantri