Declension table of ?mahādevatva

Neuter	Singular	Dual	Plural
Nominative	mahādevatvam	mahādevatve	mahādevatvāni
Vocative	mahādevatva	mahādevatve	mahādevatvāni
Accusative	mahādevatvam	mahādevatve	mahādevatvāni
Instrumental	mahādevatvena	mahādevatvābhyām	mahādevatvaiḥ
Dative	mahādevatvāya	mahādevatvābhyām	mahādevatvebhyaḥ
Ablative	mahādevatvāt	mahādevatvābhyām	mahādevatvebhyaḥ
Genitive	mahādevatvasya	mahādevatvayoḥ	mahādevatvānām
Locative	mahādevatve	mahādevatvayoḥ	mahādevatveṣu

Compound mahādevatva -

Adverb -mahādevatvam -mahādevatvāt