Declension table of tattva

Neuter	Singular	Dual	Plural
Nominative	tattvam	tattve	tattvāni
Vocative	tattva	tattve	tattvāni
Accusative	tattvam	tattve	tattvāni
Instrumental	tattvena	tattvābhyām	tattvaiḥ
Dative	tattvāya	tattvābhyām	tattvebhyaḥ
Ablative	tattvāt	tattvābhyām	tattvebhyaḥ
Genitive	tattvasya	tattvayoḥ	tattvānām
Locative	tattve	tattvayoḥ	tattveṣu

Compound tattva -

Adverb -tattvam -tattvāt