Declension table of ?hyastya

Neuter	Singular	Dual	Plural
Nominative	hyastyam	hyastye	hyastyāni
Vocative	hyastya	hyastye	hyastyāni
Accusative	hyastyam	hyastye	hyastyāni
Instrumental	hyastyena	hyastyābhyām	hyastyaiḥ
Dative	hyastyāya	hyastyābhyām	hyastyebhyaḥ
Ablative	hyastyāt	hyastyābhyām	hyastyebhyaḥ
Genitive	hyastyasya	hyastyayoḥ	hyastyānām
Locative	hyastye	hyastyayoḥ	hyastyeṣu

Compound hyastya -

Adverb -hyastyam -hyastyāt