Declension table of avataṃsa

Masculine	Singular	Dual	Plural
Nominative	avataṃsaḥ	avataṃsau	avataṃsāḥ
Vocative	avataṃsa	avataṃsau	avataṃsāḥ
Accusative	avataṃsam	avataṃsau	avataṃsān
Instrumental	avataṃsena	avataṃsābhyām	avataṃsaiḥ avataṃsebhiḥ
Dative	avataṃsāya	avataṃsābhyām	avataṃsebhyaḥ
Ablative	avataṃsāt	avataṃsābhyām	avataṃsebhyaḥ
Genitive	avataṃsasya	avataṃsayoḥ	avataṃsānām
Locative	avataṃse	avataṃsayoḥ	avataṃseṣu

Compound avataṃsa -

Adverb -avataṃsam -avataṃsāt