Declension table of ?ṛtvya

Masculine	Singular	Dual	Plural
Nominative	ṛtvyaḥ	ṛtvyau	ṛtvyāḥ
Vocative	ṛtvya	ṛtvyau	ṛtvyāḥ
Accusative	ṛtvyam	ṛtvyau	ṛtvyān
Instrumental	ṛtvyena	ṛtvyābhyām	ṛtvyaiḥ ṛtvyebhiḥ
Dative	ṛtvyāya	ṛtvyābhyām	ṛtvyebhyaḥ
Ablative	ṛtvyāt	ṛtvyābhyām	ṛtvyebhyaḥ
Genitive	ṛtvyasya	ṛtvyayoḥ	ṛtvyānām
Locative	ṛtvye	ṛtvyayoḥ	ṛtvyeṣu

Compound ṛtvya -

Adverb -ṛtvyam -ṛtvyāt