Declension table of ?svastya

Neuter	Singular	Dual	Plural
Nominative	svastyam	svastye	svastyāni
Vocative	svastya	svastye	svastyāni
Accusative	svastyam	svastye	svastyāni
Instrumental	svastyena	svastyābhyām	svastyaiḥ
Dative	svastyāya	svastyābhyām	svastyebhyaḥ
Ablative	svastyāt	svastyābhyām	svastyebhyaḥ
Genitive	svastyasya	svastyayoḥ	svastyānām
Locative	svastye	svastyayoḥ	svastyeṣu

Compound svastya -

Adverb -svastyam -svastyāt