Declension table of ?māntra

Neuter	Singular	Dual	Plural
Nominative	māntram	māntre	māntrāṇi
Vocative	māntra	māntre	māntrāṇi
Accusative	māntram	māntre	māntrāṇi
Instrumental	māntreṇa	māntrābhyām	māntraiḥ
Dative	māntrāya	māntrābhyām	māntrebhyaḥ
Ablative	māntrāt	māntrābhyām	māntrebhyaḥ
Genitive	māntrasya	māntrayoḥ	māntrāṇām
Locative	māntre	māntrayoḥ	māntreṣu

Compound māntra -

Adverb -māntram -māntrāt