Declension table of aśāstra

Masculine	Singular	Dual	Plural
Nominative	aśāstraḥ	aśāstrau	aśāstrāḥ
Vocative	aśāstra	aśāstrau	aśāstrāḥ
Accusative	aśāstram	aśāstrau	aśāstrān
Instrumental	aśāstreṇa	aśāstrābhyām	aśāstraiḥ aśāstrebhiḥ
Dative	aśāstrāya	aśāstrābhyām	aśāstrebhyaḥ
Ablative	aśāstrāt	aśāstrābhyām	aśāstrebhyaḥ
Genitive	aśāstrasya	aśāstrayoḥ	aśāstrāṇām
Locative	aśāstre	aśāstrayoḥ	aśāstreṣu

Compound aśāstra -

Adverb -aśāstram -aśāstrāt