Declension table of mahātmya

Neuter	Singular	Dual	Plural
Nominative	mahātmyam	mahātmye	mahātmyāni
Vocative	mahātmya	mahātmye	mahātmyāni
Accusative	mahātmyam	mahātmye	mahātmyāni
Instrumental	mahātmyena	mahātmyābhyām	mahātmyaiḥ
Dative	mahātmyāya	mahātmyābhyām	mahātmyebhyaḥ
Ablative	mahātmyāt	mahātmyābhyām	mahātmyebhyaḥ
Genitive	mahātmyasya	mahātmyayoḥ	mahātmyānām
Locative	mahātmye	mahātmyayoḥ	mahātmyeṣu

Compound mahātmya -

Adverb -mahātmyam -mahātmyāt