Declension table of ?dvādaśatva

Neuter	Singular	Dual	Plural
Nominative	dvādaśatvam	dvādaśatve	dvādaśatvāni
Vocative	dvādaśatva	dvādaśatve	dvādaśatvāni
Accusative	dvādaśatvam	dvādaśatve	dvādaśatvāni
Instrumental	dvādaśatvena	dvādaśatvābhyām	dvādaśatvaiḥ
Dative	dvādaśatvāya	dvādaśatvābhyām	dvādaśatvebhyaḥ
Ablative	dvādaśatvāt	dvādaśatvābhyām	dvādaśatvebhyaḥ
Genitive	dvādaśatvasya	dvādaśatvayoḥ	dvādaśatvānām
Locative	dvādaśatve	dvādaśatvayoḥ	dvādaśatveṣu

Compound dvādaśatva -

Adverb -dvādaśatvam -dvādaśatvāt