Declension table of ?somatva

Neuter	Singular	Dual	Plural
Nominative	somatvam	somatve	somatvāni
Vocative	somatva	somatve	somatvāni
Accusative	somatvam	somatve	somatvāni
Instrumental	somatvena	somatvābhyām	somatvaiḥ
Dative	somatvāya	somatvābhyām	somatvebhyaḥ
Ablative	somatvāt	somatvābhyām	somatvebhyaḥ
Genitive	somatvasya	somatvayoḥ	somatvānām
Locative	somatve	somatvayoḥ	somatveṣu

Compound somatva -

Adverb -somatvam -somatvāt