Declension table of ?astraśastra

Neuter	Singular	Dual	Plural
Nominative	astraśastram	astraśastre	astraśastrāṇi
Vocative	astraśastra	astraśastre	astraśastrāṇi
Accusative	astraśastram	astraśastre	astraśastrāṇi
Instrumental	astraśastreṇa	astraśastrābhyām	astraśastraiḥ
Dative	astraśastrāya	astraśastrābhyām	astraśastrebhyaḥ
Ablative	astraśastrāt	astraśastrābhyām	astraśastrebhyaḥ
Genitive	astraśastrasya	astraśastrayoḥ	astraśastrāṇām
Locative	astraśastre	astraśastrayoḥ	astraśastreṣu

Compound astraśastra -

Adverb -astraśastram -astraśastrāt