Declension table of ?mandatva

Neuter	Singular	Dual	Plural
Nominative	mandatvam	mandatve	mandatvāni
Vocative	mandatva	mandatve	mandatvāni
Accusative	mandatvam	mandatve	mandatvāni
Instrumental	mandatvena	mandatvābhyām	mandatvaiḥ
Dative	mandatvāya	mandatvābhyām	mandatvebhyaḥ
Ablative	mandatvāt	mandatvābhyām	mandatvebhyaḥ
Genitive	mandatvasya	mandatvayoḥ	mandatvānām
Locative	mandatve	mandatvayoḥ	mandatveṣu

Compound mandatva -

Adverb -mandatvam -mandatvāt