Declension table of ?kathya

Neuter	Singular	Dual	Plural
Nominative	kathyam	kathye	kathyāni
Vocative	kathya	kathye	kathyāni
Accusative	kathyam	kathye	kathyāni
Instrumental	kathyena	kathyābhyām	kathyaiḥ
Dative	kathyāya	kathyābhyām	kathyebhyaḥ
Ablative	kathyāt	kathyābhyām	kathyebhyaḥ
Genitive	kathyasya	kathyayoḥ	kathyānām
Locative	kathye	kathyayoḥ	kathyeṣu

Compound kathya -

Adverb -kathyam -kathyāt