Declension table of ?amartyatva

Neuter	Singular	Dual	Plural
Nominative	amartyatvam	amartyatve	amartyatvāni
Vocative	amartyatva	amartyatve	amartyatvāni
Accusative	amartyatvam	amartyatve	amartyatvāni
Instrumental	amartyatvena	amartyatvābhyām	amartyatvaiḥ
Dative	amartyatvāya	amartyatvābhyām	amartyatvebhyaḥ
Ablative	amartyatvāt	amartyatvābhyām	amartyatvebhyaḥ
Genitive	amartyatvasya	amartyatvayoḥ	amartyatvānām
Locative	amartyatve	amartyatvayoḥ	amartyatveṣu

Compound amartyatva -

Adverb -amartyatvam -amartyatvāt