Declension table of ?prahantavya

Neuter	Singular	Dual	Plural
Nominative	prahantavyam	prahantavye	prahantavyāni
Vocative	prahantavya	prahantavye	prahantavyāni
Accusative	prahantavyam	prahantavye	prahantavyāni
Instrumental	prahantavyena	prahantavyābhyām	prahantavyaiḥ
Dative	prahantavyāya	prahantavyābhyām	prahantavyebhyaḥ
Ablative	prahantavyāt	prahantavyābhyām	prahantavyebhyaḥ
Genitive	prahantavyasya	prahantavyayoḥ	prahantavyānām
Locative	prahantavye	prahantavyayoḥ	prahantavyeṣu

Compound prahantavya -

Adverb -prahantavyam -prahantavyāt