Declension table of ?drotavya

Neuter	Singular	Dual	Plural
Nominative	drotavyam	drotavye	drotavyāni
Vocative	drotavya	drotavye	drotavyāni
Accusative	drotavyam	drotavye	drotavyāni
Instrumental	drotavyena	drotavyābhyām	drotavyaiḥ
Dative	drotavyāya	drotavyābhyām	drotavyebhyaḥ
Ablative	drotavyāt	drotavyābhyām	drotavyebhyaḥ
Genitive	drotavyasya	drotavyayoḥ	drotavyānām
Locative	drotavye	drotavyayoḥ	drotavyeṣu

Compound drotavya -

Adverb -drotavyam -drotavyāt