Declension table of aṣṭasiddhi

Feminine	Singular	Dual	Plural
Nominative	aṣṭasiddhiḥ	aṣṭasiddhī	aṣṭasiddhayaḥ
Vocative	aṣṭasiddhe	aṣṭasiddhī	aṣṭasiddhayaḥ
Accusative	aṣṭasiddhim	aṣṭasiddhī	aṣṭasiddhīḥ
Instrumental	aṣṭasiddhyā	aṣṭasiddhibhyām	aṣṭasiddhibhiḥ
Dative	aṣṭasiddhyai aṣṭasiddhaye	aṣṭasiddhibhyām	aṣṭasiddhibhyaḥ
Ablative	aṣṭasiddhyāḥ aṣṭasiddheḥ	aṣṭasiddhibhyām	aṣṭasiddhibhyaḥ
Genitive	aṣṭasiddhyāḥ aṣṭasiddheḥ	aṣṭasiddhyoḥ	aṣṭasiddhīnām
Locative	aṣṭasiddhyām aṣṭasiddhau	aṣṭasiddhyoḥ	aṣṭasiddhiṣu

Compound aṣṭasiddhi -

Adverb -aṣṭasiddhi