Declension table of ?ṛktha

Neuter	Singular	Dual	Plural
Nominative	ṛktham	ṛkthe	ṛkthāni
Vocative	ṛktha	ṛkthe	ṛkthāni
Accusative	ṛktham	ṛkthe	ṛkthāni
Instrumental	ṛkthena	ṛkthābhyām	ṛkthaiḥ
Dative	ṛkthāya	ṛkthābhyām	ṛkthebhyaḥ
Ablative	ṛkthāt	ṛkthābhyām	ṛkthebhyaḥ
Genitive	ṛkthasya	ṛkthayoḥ	ṛkthānām
Locative	ṛkthe	ṛkthayoḥ	ṛktheṣu

Compound ṛktha -

Adverb -ṛktham -ṛkthāt