Declension table of ?vastya

Masculine	Singular	Dual	Plural
Nominative	vastyaḥ	vastyau	vastyāḥ
Vocative	vastya	vastyau	vastyāḥ
Accusative	vastyam	vastyau	vastyān
Instrumental	vastyena	vastyābhyām	vastyaiḥ vastyebhiḥ
Dative	vastyāya	vastyābhyām	vastyebhyaḥ
Ablative	vastyāt	vastyābhyām	vastyebhyaḥ
Genitive	vastyasya	vastyayoḥ	vastyānām
Locative	vastye	vastyayoḥ	vastyeṣu

Compound vastya -

Adverb -vastyam -vastyāt