Declension table of ?vacasya

Neuter	Singular	Dual	Plural
Nominative	vacasyam	vacasye	vacasyāni
Vocative	vacasya	vacasye	vacasyāni
Accusative	vacasyam	vacasye	vacasyāni
Instrumental	vacasyena	vacasyābhyām	vacasyaiḥ
Dative	vacasyāya	vacasyābhyām	vacasyebhyaḥ
Ablative	vacasyāt	vacasyābhyām	vacasyebhyaḥ
Genitive	vacasyasya	vacasyayoḥ	vacasyānām
Locative	vacasye	vacasyayoḥ	vacasyeṣu

Compound vacasya -

Adverb -vacasyam -vacasyāt