Declension table of ?brahmamantra

Masculine	Singular	Dual	Plural
Nominative	brahmamantraḥ	brahmamantrau	brahmamantrāḥ
Vocative	brahmamantra	brahmamantrau	brahmamantrāḥ
Accusative	brahmamantram	brahmamantrau	brahmamantrān
Instrumental	brahmamantreṇa	brahmamantrābhyām	brahmamantraiḥ brahmamantrebhiḥ
Dative	brahmamantrāya	brahmamantrābhyām	brahmamantrebhyaḥ
Ablative	brahmamantrāt	brahmamantrābhyām	brahmamantrebhyaḥ
Genitive	brahmamantrasya	brahmamantrayoḥ	brahmamantrāṇām
Locative	brahmamantre	brahmamantrayoḥ	brahmamantreṣu

Compound brahmamantra -

Adverb -brahmamantram -brahmamantrāt