Declension table of ?samarthya

Neuter	Singular	Dual	Plural
Nominative	samarthyam	samarthye	samarthyāni
Vocative	samarthya	samarthye	samarthyāni
Accusative	samarthyam	samarthye	samarthyāni
Instrumental	samarthyena	samarthyābhyām	samarthyaiḥ
Dative	samarthyāya	samarthyābhyām	samarthyebhyaḥ
Ablative	samarthyāt	samarthyābhyām	samarthyebhyaḥ
Genitive	samarthyasya	samarthyayoḥ	samarthyānām
Locative	samarthye	samarthyayoḥ	samarthyeṣu

Compound samarthya -

Adverb -samarthyam -samarthyāt