Declension table of ?ṣaṭtva

Neuter	Singular	Dual	Plural
Nominative	ṣaṭtvam	ṣaṭtve	ṣaṭtvāni
Vocative	ṣaṭtva	ṣaṭtve	ṣaṭtvāni
Accusative	ṣaṭtvam	ṣaṭtve	ṣaṭtvāni
Instrumental	ṣaṭtvena	ṣaṭtvābhyām	ṣaṭtvaiḥ
Dative	ṣaṭtvāya	ṣaṭtvābhyām	ṣaṭtvebhyaḥ
Ablative	ṣaṭtvāt	ṣaṭtvābhyām	ṣaṭtvebhyaḥ
Genitive	ṣaṭtvasya	ṣaṭtvayoḥ	ṣaṭtvānām
Locative	ṣaṭtve	ṣaṭtvayoḥ	ṣaṭtveṣu

Compound ṣaṭtva -

Adverb -ṣaṭtvam -ṣaṭtvāt