Declension table of ?praśāstra

Neuter	Singular	Dual	Plural
Nominative	praśāstram	praśāstre	praśāstrāṇi
Vocative	praśāstra	praśāstre	praśāstrāṇi
Accusative	praśāstram	praśāstre	praśāstrāṇi
Instrumental	praśāstreṇa	praśāstrābhyām	praśāstraiḥ
Dative	praśāstrāya	praśāstrābhyām	praśāstrebhyaḥ
Ablative	praśāstrāt	praśāstrābhyām	praśāstrebhyaḥ
Genitive	praśāstrasya	praśāstrayoḥ	praśāstrāṇām
Locative	praśāstre	praśāstrayoḥ	praśāstreṣu

Compound praśāstra -

Adverb -praśāstram -praśāstrāt