Declension table of ?śāpāstra

Masculine	Singular	Dual	Plural
Nominative	śāpāstraḥ	śāpāstrau	śāpāstrāḥ
Vocative	śāpāstra	śāpāstrau	śāpāstrāḥ
Accusative	śāpāstram	śāpāstrau	śāpāstrān
Instrumental	śāpāstreṇa	śāpāstrābhyām	śāpāstraiḥ śāpāstrebhiḥ
Dative	śāpāstrāya	śāpāstrābhyām	śāpāstrebhyaḥ
Ablative	śāpāstrāt	śāpāstrābhyām	śāpāstrebhyaḥ
Genitive	śāpāstrasya	śāpāstrayoḥ	śāpāstrāṇām
Locative	śāpāstre	śāpāstrayoḥ	śāpāstreṣu

Compound śāpāstra -

Adverb -śāpāstram -śāpāstrāt