Declension table of nityatva

Neuter	Singular	Dual	Plural
Nominative	nityatvam	nityatve	nityatvāni
Vocative	nityatva	nityatve	nityatvāni
Accusative	nityatvam	nityatve	nityatvāni
Instrumental	nityatvena	nityatvābhyām	nityatvaiḥ
Dative	nityatvāya	nityatvābhyām	nityatvebhyaḥ
Ablative	nityatvāt	nityatvābhyām	nityatvebhyaḥ
Genitive	nityatvasya	nityatvayoḥ	nityatvānām
Locative	nityatve	nityatvayoḥ	nityatveṣu

Compound nityatva -

Adverb -nityatvam -nityatvāt