Declension table of ?saptatantra

Masculine	Singular	Dual	Plural
Nominative	saptatantraḥ	saptatantrau	saptatantrāḥ
Vocative	saptatantra	saptatantrau	saptatantrāḥ
Accusative	saptatantram	saptatantrau	saptatantrān
Instrumental	saptatantreṇa	saptatantrābhyām	saptatantraiḥ saptatantrebhiḥ
Dative	saptatantrāya	saptatantrābhyām	saptatantrebhyaḥ
Ablative	saptatantrāt	saptatantrābhyām	saptatantrebhyaḥ
Genitive	saptatantrasya	saptatantrayoḥ	saptatantrāṇām
Locative	saptatantre	saptatantrayoḥ	saptatantreṣu

Compound saptatantra -

Adverb -saptatantram -saptatantrāt