Declension table of ?mahāsya

Masculine	Singular	Dual	Plural
Nominative	mahāsyaḥ	mahāsyau	mahāsyāḥ
Vocative	mahāsya	mahāsyau	mahāsyāḥ
Accusative	mahāsyam	mahāsyau	mahāsyān
Instrumental	mahāsyena	mahāsyābhyām	mahāsyaiḥ mahāsyebhiḥ
Dative	mahāsyāya	mahāsyābhyām	mahāsyebhyaḥ
Ablative	mahāsyāt	mahāsyābhyām	mahāsyebhyaḥ
Genitive	mahāsyasya	mahāsyayoḥ	mahāsyānām
Locative	mahāsye	mahāsyayoḥ	mahāsyeṣu

Compound mahāsya -

Adverb -mahāsyam -mahāsyāt