Declension table of ?śastra

Neuter	Singular	Dual	Plural
Nominative	śastram	śastre	śastrāṇi
Vocative	śastra	śastre	śastrāṇi
Accusative	śastram	śastre	śastrāṇi
Instrumental	śastreṇa	śastrābhyām	śastraiḥ
Dative	śastrāya	śastrābhyām	śastrebhyaḥ
Ablative	śastrāt	śastrābhyām	śastrebhyaḥ
Genitive	śastrasya	śastrayoḥ	śastrāṇām
Locative	śastre	śastrayoḥ	śastreṣu

Compound śastra -

Adverb -śastram -śastrāt