Declension table of ?sādhumantra

Masculine	Singular	Dual	Plural
Nominative	sādhumantraḥ	sādhumantrau	sādhumantrāḥ
Vocative	sādhumantra	sādhumantrau	sādhumantrāḥ
Accusative	sādhumantram	sādhumantrau	sādhumantrān
Instrumental	sādhumantreṇa	sādhumantrābhyām	sādhumantraiḥ sādhumantrebhiḥ
Dative	sādhumantrāya	sādhumantrābhyām	sādhumantrebhyaḥ
Ablative	sādhumantrāt	sādhumantrābhyām	sādhumantrebhyaḥ
Genitive	sādhumantrasya	sādhumantrayoḥ	sādhumantrāṇām
Locative	sādhumantre	sādhumantrayoḥ	sādhumantreṣu

Compound sādhumantra -

Adverb -sādhumantram -sādhumantrāt