Declension table of ?mahāśastra

Neuter	Singular	Dual	Plural
Nominative	mahāśastram	mahāśastre	mahāśastrāṇi
Vocative	mahāśastra	mahāśastre	mahāśastrāṇi
Accusative	mahāśastram	mahāśastre	mahāśastrāṇi
Instrumental	mahāśastreṇa	mahāśastrābhyām	mahāśastraiḥ
Dative	mahāśastrāya	mahāśastrābhyām	mahāśastrebhyaḥ
Ablative	mahāśastrāt	mahāśastrābhyām	mahāśastrebhyaḥ
Genitive	mahāśastrasya	mahāśastrayoḥ	mahāśastrāṇām
Locative	mahāśastre	mahāśastrayoḥ	mahāśastreṣu

Compound mahāśastra -

Adverb -mahāśastram -mahāśastrāt