Declension table of ?saptamantra

Masculine	Singular	Dual	Plural
Nominative	saptamantraḥ	saptamantrau	saptamantrāḥ
Vocative	saptamantra	saptamantrau	saptamantrāḥ
Accusative	saptamantram	saptamantrau	saptamantrān
Instrumental	saptamantreṇa	saptamantrābhyām	saptamantraiḥ saptamantrebhiḥ
Dative	saptamantrāya	saptamantrābhyām	saptamantrebhyaḥ
Ablative	saptamantrāt	saptamantrābhyām	saptamantrebhyaḥ
Genitive	saptamantrasya	saptamantrayoḥ	saptamantrāṇām
Locative	saptamantre	saptamantrayoḥ	saptamantreṣu

Compound saptamantra -

Adverb -saptamantram -saptamantrāt