Declension table of ?devāyatana

Neuter	Singular	Dual	Plural
Nominative	devāyatanam	devāyatane	devāyatanāni
Vocative	devāyatana	devāyatane	devāyatanāni
Accusative	devāyatanam	devāyatane	devāyatanāni
Instrumental	devāyatanena	devāyatanābhyām	devāyatanaiḥ
Dative	devāyatanāya	devāyatanābhyām	devāyatanebhyaḥ
Ablative	devāyatanāt	devāyatanābhyām	devāyatanebhyaḥ
Genitive	devāyatanasya	devāyatanayoḥ	devāyatanānām
Locative	devāyatane	devāyatanayoḥ	devāyataneṣu

Compound devāyatana -

Adverb -devāyatanam -devāyatanāt