Declension table of ?śāstratva

Neuter	Singular	Dual	Plural
Nominative	śāstratvam	śāstratve	śāstratvāni
Vocative	śāstratva	śāstratve	śāstratvāni
Accusative	śāstratvam	śāstratve	śāstratvāni
Instrumental	śāstratvena	śāstratvābhyām	śāstratvaiḥ
Dative	śāstratvāya	śāstratvābhyām	śāstratvebhyaḥ
Ablative	śāstratvāt	śāstratvābhyām	śāstratvebhyaḥ
Genitive	śāstratvasya	śāstratvayoḥ	śāstratvānām
Locative	śāstratve	śāstratvayoḥ	śāstratveṣu

Compound śāstratva -

Adverb -śāstratvam -śāstratvāt