Declension table of ?katthya

Neuter	Singular	Dual	Plural
Nominative	katthyam	katthye	katthyāni
Vocative	katthya	katthye	katthyāni
Accusative	katthyam	katthye	katthyāni
Instrumental	katthyena	katthyābhyām	katthyaiḥ
Dative	katthyāya	katthyābhyām	katthyebhyaḥ
Ablative	katthyāt	katthyābhyām	katthyebhyaḥ
Genitive	katthyasya	katthyayoḥ	katthyānām
Locative	katthye	katthyayoḥ	katthyeṣu

Compound katthya -

Adverb -katthyam -katthyāt