Declension table of ?vratastha

Masculine	Singular	Dual	Plural
Nominative	vratasthaḥ	vratasthau	vratasthāḥ
Vocative	vratastha	vratasthau	vratasthāḥ
Accusative	vratastham	vratasthau	vratasthān
Instrumental	vratasthena	vratasthābhyām	vratasthaiḥ vratasthebhiḥ
Dative	vratasthāya	vratasthābhyām	vratasthebhyaḥ
Ablative	vratasthāt	vratasthābhyām	vratasthebhyaḥ
Genitive	vratasthasya	vratasthayoḥ	vratasthānām
Locative	vratasthe	vratasthayoḥ	vratastheṣu

Compound vratastha -

Adverb -vratastham -vratasthāt