Declension table of ?tāntra

Neuter	Singular	Dual	Plural
Nominative	tāntram	tāntre	tāntrāṇi
Vocative	tāntra	tāntre	tāntrāṇi
Accusative	tāntram	tāntre	tāntrāṇi
Instrumental	tāntreṇa	tāntrābhyām	tāntraiḥ
Dative	tāntrāya	tāntrābhyām	tāntrebhyaḥ
Ablative	tāntrāt	tāntrābhyām	tāntrebhyaḥ
Genitive	tāntrasya	tāntrayoḥ	tāntrāṇām
Locative	tāntre	tāntrayoḥ	tāntreṣu

Compound tāntra -

Adverb -tāntram -tāntrāt