Declension table of ?nirmantra

Masculine	Singular	Dual	Plural
Nominative	nirmantraḥ	nirmantrau	nirmantrāḥ
Vocative	nirmantra	nirmantrau	nirmantrāḥ
Accusative	nirmantram	nirmantrau	nirmantrān
Instrumental	nirmantreṇa	nirmantrābhyām	nirmantraiḥ nirmantrebhiḥ
Dative	nirmantrāya	nirmantrābhyām	nirmantrebhyaḥ
Ablative	nirmantrāt	nirmantrābhyām	nirmantrebhyaḥ
Genitive	nirmantrasya	nirmantrayoḥ	nirmantrāṇām
Locative	nirmantre	nirmantrayoḥ	nirmantreṣu

Compound nirmantra -

Adverb -nirmantram -nirmantrāt