Declension table of ?mahāsya

Neuter	Singular	Dual	Plural
Nominative	mahāsyam	mahāsye	mahāsyāni
Vocative	mahāsya	mahāsye	mahāsyāni
Accusative	mahāsyam	mahāsye	mahāsyāni
Instrumental	mahāsyena	mahāsyābhyām	mahāsyaiḥ
Dative	mahāsyāya	mahāsyābhyām	mahāsyebhyaḥ
Ablative	mahāsyāt	mahāsyābhyām	mahāsyebhyaḥ
Genitive	mahāsyasya	mahāsyayoḥ	mahāsyānām
Locative	mahāsye	mahāsyayoḥ	mahāsyeṣu

Compound mahāsya -

Adverb -mahāsyam -mahāsyāt