Declension table of astra

Neuter	Singular	Dual	Plural
Nominative	astram	astre	astrāṇi
Vocative	astra	astre	astrāṇi
Accusative	astram	astre	astrāṇi
Instrumental	astreṇa	astrābhyām	astraiḥ
Dative	astrāya	astrābhyām	astrebhyaḥ
Ablative	astrāt	astrābhyām	astrebhyaḥ
Genitive	astrasya	astrayoḥ	astrāṇām
Locative	astre	astrayoḥ	astreṣu

Compound astra -

Adverb -astram -astrāt