Declension table of ?siddhavīrya

Masculine	Singular	Dual	Plural
Nominative	siddhavīryaḥ	siddhavīryau	siddhavīryāḥ
Vocative	siddhavīrya	siddhavīryau	siddhavīryāḥ
Accusative	siddhavīryam	siddhavīryau	siddhavīryān
Instrumental	siddhavīryeṇa	siddhavīryābhyām	siddhavīryaiḥ siddhavīryebhiḥ
Dative	siddhavīryāya	siddhavīryābhyām	siddhavīryebhyaḥ
Ablative	siddhavīryāt	siddhavīryābhyām	siddhavīryebhyaḥ
Genitive	siddhavīryasya	siddhavīryayoḥ	siddhavīryāṇām
Locative	siddhavīrye	siddhavīryayoḥ	siddhavīryeṣu

Compound siddhavīrya -

Adverb -siddhavīryam -siddhavīryāt