Declension table of ?mahādevatantra

Neuter	Singular	Dual	Plural
Nominative	mahādevatantram	mahādevatantre	mahādevatantrāṇi
Vocative	mahādevatantra	mahādevatantre	mahādevatantrāṇi
Accusative	mahādevatantram	mahādevatantre	mahādevatantrāṇi
Instrumental	mahādevatantreṇa	mahādevatantrābhyām	mahādevatantraiḥ
Dative	mahādevatantrāya	mahādevatantrābhyām	mahādevatantrebhyaḥ
Ablative	mahādevatantrāt	mahādevatantrābhyām	mahādevatantrebhyaḥ
Genitive	mahādevatantrasya	mahādevatantrayoḥ	mahādevatantrāṇām
Locative	mahādevatantre	mahādevatantrayoḥ	mahādevatantreṣu

Compound mahādevatantra -

Adverb -mahādevatantram -mahādevatantrāt