Declension table of ?mahāstra

Neuter	Singular	Dual	Plural
Nominative	mahāstram	mahāstre	mahāstrāṇi
Vocative	mahāstra	mahāstre	mahāstrāṇi
Accusative	mahāstram	mahāstre	mahāstrāṇi
Instrumental	mahāstreṇa	mahāstrābhyām	mahāstraiḥ
Dative	mahāstrāya	mahāstrābhyām	mahāstrebhyaḥ
Ablative	mahāstrāt	mahāstrābhyām	mahāstrebhyaḥ
Genitive	mahāstrasya	mahāstrayoḥ	mahāstrāṇām
Locative	mahāstre	mahāstrayoḥ	mahāstreṣu

Compound mahāstra -

Adverb -mahāstram -mahāstrāt